| Diagnosis and Testing Connector Circuit Reference Powertrain Control Module (PCM) C175b Circ Ref | Pin Number(s) | Circuit Designation/Description | Normal Condition/Measurement | | 2 | 325 (DB/OG) sends signal to starter relay | 0 volts, less than 5 ohms between the PCM and the starter relay. | | 31 | 167 (BN/OG) sends signal to PATS | 0 volts, less than 5 ohms between the PCM and the PATS transceiver. Greater than 10,000 ohms between the PCM and ground. | | 42 | 168 (RD/BK) receives signal from the PATS transceiver | 0 volts, less than 5 ohms between the PCM and the PATS transceiver. Greater than 10,000 ohms between the PCM and ground. | Passive Anti-Theft System (PATS) Transceiver C2007 Circ Ref | Pin Number(s) | Circuit Designation/Description | Normal Condition/Measurement | | 1 | 296 (WH/VT) power to the PATS transceiver | Greater than 10 volts with the key ON or OFF. | | 2 | 570 (BK/WH) ground for the PATS transceiver | 0 volts, less than 5 ohms between the PATS transceiver and ground. | | 3 | 167 (BN/OG) receives signal from PCM | 0 volts, less than 5 ohms between the PATS transceiver and the PCM. Greater than 10,000 ohms between the PATS transceiver and ground. | | 4 | 168 (RD/BK) transmits signal to PCM | 0 volts, less than 5 ohms between the PATS transceiver and the PCM. Greater than 10,000 ohms between the PATS transceiver and ground. | Pinpoint Test A: Antenna Not Connected Normal Operation During each vehicle start sequence, the transceiver module reads the encoded ignition key identification code and sends the data to the PCM. Possible Causes Pinpoint Test B: Non-Pats/Encrypted Key Or Damaged Key Normal Operation During each vehicle start sequence, the transceiver module reads the encoded ignition key identification code and sends the data to the PCM. The PCM then compares this data with stored values to determine start enable. Possible Causes - PATS transceiver
- PCM
- electronic encoded ignition key
| PINPOINT TEST B : NON-PATS/ENCRYPTED KEY OR DAMAGED KEY | NOTE:Large metallic objects, electronic devices on the key chain that can be used to purchase gasoline or similar items, or a second key on the same key ring as the passive anti-theft system (PATS) ignition key may cause vehicle starting concerns and record DTCs under certain conditions. If a fault cannot be identified, examine the customer's key ring for such objects or devices. If present, inform the customer that they need to keep these objects from touching the PATS ignition key while starting the engine. These objects and devices cannot damage the PATS ignition key, but can cause a momentary problem if they are too close to the key during engine start. If a problem occurs, turn ignition OFF and restart the engine with all other objects on the key ring held away from the ignition key. Check to make sure the encoded ignition key used by the customer is an approved encoded ignition key (encoded ignition keys from Huf, Rotunda, or Strattec are approved encoded ignition keys). | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | B1: RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCS) | | | 1 Clear the continuous DTCs. | | | 2 Key in OFF position. | | | 3 Key in ON position. | | | 4 Retrieve the PCM continuous DTCs | | | Is DTC B1600 retrieved? Yes No | | B2: PROGRAM THE NEW ENCODED IGNITION KEY | NOTE:Check to make sure the customer and newly encoded ignition keys are approved encoded PATS ignition keys. Unapproved PATS keys do not always operate correctly over different temperature ranges (encoded ignition keys from Huf, Rotunda, or Strattec are approved encoded ignition keys). | | | 1 Cut a new encoded ignition key. | | | 2 | | | 3 Clear the continuous DTCs. | | | 4 Key in OFF position. | | | 5 Key in ON position. | | | 6 Retrieve the PCM continuous DTCs | | | Is DTC B1600 present? Yes No | | B3: INSTALL A NEW PATS TRANSCEIVER | NOTE:When a new PCM is installed, the encoded ignition keys must be reprogrammed. | | | 1 Key in OFF position. | | | 2 | | | 3 Key in ON position. | | | 4 Clear the continuous DTCs. | | | 5 Retrieve the PCM continuous DTCs. | | | NOTE:Do not use the encoded ignition key that was programmed in Step B2. 6 Turn the ignition to RUN using an existing customer encoded ignition key. | | | 7 Retrieve the PCM continuous DTCs | | | Is DTC B1600 retrieved? Yes No The system is OK. | | B4: CHECK THE PCM FOR CORRECT OPERATION | | | 1 Disconnect all the PCM connectors. | | | 2 Check for: - corrosion
- pushed-out pins
| | | 3 Connect all the PCM connectors and make sure they seat correctly. | | | 4 Operate the system and verify the concern is still present. | | | Is the concern still present? Yes No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. | Pinpoint Test C: Unprogrammed PATS Key Normal Operation During each vehicle start sequence, the transceiver module reads the encoded ignition key identification code and circuit 168 (RD/BK) sends the data to the PCM. Possible Causes - PATS transceiver
- PCM
- electronic encoded ignition key
| PINPOINT TEST C : UNPROGRAMMED PATS KEY | NOTE:The PCM disables the engine for one second every time DTC B1601 is set. The ignition must remain in the RUN position for at least one second before an attempt is made to start the vehicle with any encoded ignition key. Check the PCM PID ANTI diagnostic for this unprogrammed key timeout status. | NOTE:Large metallic objects, electronic devices on the key chain that can be used to purchase gasoline or similar items, or a second key on the same key ring as the passive anti-theft system (PATS) ignition key may cause vehicle starting concerns and record DTCs under certain conditions. If a fault cannot be identified, examine the customer's key ring for such objects or devices. If present, inform the customer that they need to keep these objects from touching the PATS ignition key while starting the engine. These objects and devices cannot damage the PATS ignition key, but can cause a momentary problem if they are too close to the key during engine start. If a problem occurs, turn ignition OFF and restart the engine with all other objects on the key ring held away from the ignition key. Check to make sure the encoded ignition key used by the customer is an approved encoded ignition key (encoded ignition keys from Huf, Rotunda, or Strattec are approved encoded ignition keys). | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | C1: RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCS) | | | 1 Clear the continuous DTCs. | | | 2 Key in OFF position. | | | 3 Key in ON position. | | | 4 Retrieve the PCM continuous DTCs. | | | Is DTC B1601 retrieved? Yes No The system is OK. CHECK all the customer's encoded ignition keys by attempting to start the vehicle with each key to verify all other encoded ignition keys are programmed. | | C2: CHECK FOR PROGRAMMED ENCODED IGNITION KEYS — MONITOR THE PCM PID NUMKEYS | | | 1 Monitor the PCM PID NUMKEYS. | | | Does the PCM PID NUMKEYS display 8? Yes No | | C3: CHECK THE NUMBER OF PROGRAMMED ENCODED IGNITION KEYS AVAILABLE | | | 1 Verify there are at least 2 currently programmed encoded ignition keys available with the vehicle. | | | Are at least 2 currently programmed encoded ignition keys available with the vehicle? Yes No | | C4: VERIFY THE PCM PID SPARE_KY INDICATES YES | | | 1 Monitor and record PID/DATA. | | | 2 Monitor the PCM PID SPARE_KY. | | | Does the PCM PID SPARE_KY indicate ENABLE? Yes No | | C5: CHECK THE ENCODED IGNITION KEYS FOR CORRECT OPERATION | | | 1 Key in OFF position. | | | 2 Turn the ignition switch to RUN for 3 seconds using the first encoded ignition key. | | | 3 Key in ON position. | | | 4 Turn the ignition switch to RUN for 3 seconds using the second ignition key. | | | 5 Start the vehicle using the second encoded ignition key. | | | Does the vehicle start? Yes No | | C6: RETRIEVE THE DTCS — CHECK FOR DTC B1601 | NOTE:When a new PCM is installed, the encoded ignition keys must be reprogrammed. | | | 1 Clear the continuous DTCs. | | | 2 Key in OFF position. | | | 3 Key in ON position. | | | 4 Retrieve the PCM continuous DTCs | | | Is DTC B1601 retrieved? Yes No | | C7: CHECK THE PCM FOR CORRECT OPERATION | | | 1 Disconnect all the PCM connectors. | | | 2 Check for: - corrosion
- pushed-out pins
| | | 3 Connect all the PCM connectors and make sure they seat correctly. | | | 4 Operate the system and verify the concern is still present. | | | Is the concern still present? Yes No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. | Pinpoint Test D: PATS Received Invalid Format of Key-Code From Ignition Key Transponder Normal Operation During each vehicle start sequence, the transceiver module reads the encoded ignition key identification code and circuit 168 (RD/BK) sends the data to the PCM. Possible Causes - PATS transceiver
- PCM
- electronic encoded ignition key
| PINPOINT TEST D : PATS RECEIVED INVALID FORMAT OF KEY-CODE FROM IGNITION KEY TRANSPONDER | NOTE:Large metallic objects, electronic devices on the key chain that can be used to purchase gasoline or similar items, or a second key on the same key ring as the passive anti-theft system (PATS) ignition key may cause vehicle starting concerns and record DTCs under certain conditions. If a fault cannot be identified, examine the customer's key ring for such objects or devices. If present, inform the customer that they need to keep these objects from touching the PATS ignition key while starting the engine. These objects and devices cannot damage the PATS ignition key, but can cause a momentary problem if they are too close to the key during engine start. If a problem occurs, turn ignition OFF and restart the engine with all other objects on the key ring held away from the ignition key. Check to make sure the encoded ignition key used by the customer is an approved encoded ignition key (encoded ignition keys from Huf, Rotunda, or Strattec are approved encoded ignition keys). | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | D1: RETRIEVE THE DTCS | | | 1 Clear the continuous DTCs. | | | 2 Key in OFF position. | | | 3 Key in ON position. | | | 4 Retrieve the PCM continuous DTCs. | | | Is DTC B1602 retrieved? Yes No The system is OK. CHECK all customer encoded ignition keys by cycling them in the ignition switch and determining if the vehicle starts. | | D2: REPLACE THE ENCODED IGNITION KEY | NOTE:Check to make sure the customer key and the replacement encoded ignition keys are approved encoded PATS ignition keys. Unapproved PATS keys do not always operate correctly over different temperature ranges (encoded ignition keys from Huf, Rotunda, Curtis, or Strattec are approved encoded ignition keys). | | | 1 Cut a new encoded ignition key. | | | 2 | | | 3 Key in OFF position. | | | 4 Key in ON position. | | | 5 Retrieve the PCM continuous DTCs. | | | Is DTC B1602 retrieved? Yes No | | D3: INSTALL A NEW PATS TRANSCEIVER | | | 1 Key in OFF position. | | | 2 | | | 3 Key in ON position. | | | 4 Clear the continuous DTCs. | | | 5 Retrieve the PCM continuous DTCs. | | | Are any PATS DTCs retrieved? Yes REFER to Passive Anti-Theft System (PATS) Diagnostic Trouble Codes (DTC) Index. No The system is OK. | Pinpoint Test E: Pats Transceiver Module Signal is Not Received Normal Operation During each vehicle start sequence, the PATS transceiver module reads the encoded ignition key identification code and circuit 168 (RD/BK) sends the data to the PCM. Possible Causes - PATS transceiver
- PCM
- electronic encoded ignition key
- circuit 296 (WH/VT) open or shorted to ground
- circuit 570 (BK/WH) open
- circuit 167 (BN/OG) open or shorted to ground
- circuit 168 (RD/BK) open, shorted to power, or shorted to ground
| PINPOINT TEST E : PATS TRANSCEIVER MODULE SIGNAL IS NOT RECEIVED | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | E1: RETRIEVE THE DTCS | | | 1 Clear the continuous DTCs. | | | 2 Key in OFF position. | | | 3 Key in ON position. | | | 4 Retrieve the PCM continuous DTCs. | | | Is DTC B1681 retrieved? Yes No The system is OK. | | E2: CHECK THE PATS TRANSCEIVER CIRCUIT 296 (WH/VT) FOR VOLTAGE | | | 1 Key in OFF position. | | | 2 Disconnect: PATS transceiver C2007. | | | 3 Key in ON position. | | | 4 Measure the voltage between the PATS transceiver C2007-1, circuit 296 (WH/VT), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. | | E3: CHECK THE PATS TRANSCEIVER GROUND CIRCUIT 570 (BK/WH) FOR AN OPEN | | | 1 Key in OFF position. | | | 2 Measure the resistance between the PATS transceiver C2007-2, circuit 570 (BK/WH), harness side and ground. | | | Is the resistance less than 5 ohms? Yes No REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. | | E4: CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT 167 (BN/OG) FOR VOLTAGE | | | 1 Connect: PATS transceiver C2007. | | | 2 Key in ON position. | | | 3 Measure the voltage by back-probing between the PATS transceiver C2007-3, circuit 167 (BN/OG), harness side and ground. | | | Is the voltage greater than 9 volts? Yes No | | E5: CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT 167 (BN/OG) FOR A SHORT TO GROUND | | | 1 Key in OFF position. | | | 2 Disconnect: PATS transceiver C2007. | | | 3 Measure the resistance between the PATS transceiver C2007-3, circuit 167 (BN/OG), harness side and ground. | | | Is the resistance greater than 10,000 ohms? Yes No | | E6: CHECK CIRCUIT 167 (BN/OG) FOR AN OPEN | | | 1 Key in OFF position. | | | 2 Disconnect: PCM C175b. | | | 3 Measure the resistance between the PATS transceiver C2007-3, circuit 167 (BN/OG), harness side and PCM C175b-31, circuit 167 (BN/OG), harness side. | | | Is the resistance less than 5 ohms? Yes No REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. | | E7: CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT 168 (RD/BK) FOR VOLTAGE | | | 1 Connect: PATS transceiver C2007. | | | 2 Connect: PCM C175b. | | | 3 Key in ON position. | | | 4 Measure the voltage by back-probing between the PATS transceiver C2007-4, circuit 168 (RD/BK), harness side and ground. | | | Is the voltage greater than 9 volts? Yes No | | E8: CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT FOR A SHORT TO GROUND CIRCUIT 168 (RD/BK) TRANSCEIVER CONNECTED | | | 1 Key in OFF position. | | | 2 Disconnect: PCM C175b. | | | 3 Measure the resistance between the PCM C175b-42, circuit 168 (RD/BK), harness side and ground. | | | Is the resistance greater than 10,000 ohms? Yes No | | E9: CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT FOR A SHORT TO GROUND CIRCUIT 168 (RD/BK) TRANSCEIVER DISCONNECTED | | | 1 Disconnect: PATS transceiver C2007. | | | 2 Measure the resistance between the PATS transceiver C2007-4, circuit 168 (RD/BK), harness side and ground. | | | Is the resistance greater than 10,000 ohms? Yes No REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. | | E10: CHECK THE PATS TRANSMIT CIRCUIT 168 (RD/BK) FOR AN OPEN | NOTE:When a new PCM is installed, the encoded ignition keys must be reprogrammed. | | | 1 Disconnect: PATS transceiver C2007. | | | 2 Measure the resistance between the PATS transceiver C2007-4, circuit 168 (RD/BK), harness side and the PCM C175b-42, circuit 168 (RD/BK), harness side. | | | Is the resistance less than 5 ohms? Yes No REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. | | E11: CHECK THE TRANSCEIVER TRANSMIT CIRCUIT 168 (RD/BK) FOR VOLTAGE | | | 1 Select PCM active command TRANSMIT SIGNAL COMMAND. | | | 2 Trigger TRANSMIT to ON. | | | 3 Measure the voltage by back-probing between the PATS transceiver C2007-4, circuit 168 (RD/BK), harness side and ground. | | | Is the voltage less than 5 volts? Yes No | | E12: CHECK CIRCUIT 168 (RD/BK) FOR A SHORT TO BATTERY | NOTE:When a new PCM is installed, the encoded ignition keys must be reprogrammed. | | | 1 Key in OFF position. | | | 2 Disconnect: PCM C175b. | | | 3 Disconnect: PATS transceiver C2007. | | | 4 Key in ON position. | | | 5 Measure the voltage between the PATS C2007-4, circuit 168 (RD/BK), harness side and ground. | | | Is any voltage present? Yes REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. No | | E13: CHECK THE PCM FOR CORRECT OPERATION | | | 1 Disconnect all the PCM connectors. | | | 2 Check for: - corrosion
- pushed-out pins
| | | 3 Connect all the PCM connectors and make sure they seat correctly. | | | 4 Operate the system and verify the concern is still present. | | | Is the concern still present? Yes No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. | Pinpoint Test F: Anti-Theft Number of Programmed Keys is Below Minimum Normal Operation The transceiver module communicates with the encoded ignition key. During each vehicle start sequence, the transceiver module reads the encoded ignition key identification code and circuit 168 (RD/BK) sends the data to the PCM. The control functions are contained in the PCM. This module carries out all of the PATS functions such as receiving the identification code from the encoded ignition key and controlling engine enable. The PCM initiates the key interrogation sequence when the vehicle ignition switch is turned to RUN or START. Possible Causes - less than 2 keys programmed to the system
- PATS transceiver
- unprogrammed PATS key
- PCM
| PINPOINT TEST F : ANTI-THEFT NUMBER OF PROGRAMMED KEYS IS BELOW MINIMUM | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | F1: RETRIEVE THE DTCS | | | 1 Clear the continuous DTCs. | | | 2 Key in OFF position. | | | 3 Key in ON position. | | | 4 Retrieve the PCM continuous DTCs. | | | Is DTC B1213 retrieved? Yes No | | F2: CHECK THE NUMBER OF KEYS ENCODED MONITOR THE PCM PID NUMKEYS | | | 1 Monitor and record the PID/DATA. | | | 2 Monitor the PCM PID NUMKEYS. | | | Does the PCM PID NUMKEYS display less than two encoded ignition keys programmed? Yes No The system is OK. | | F3: PROGRAM ENCODED IGNITION KEYS | | | NOTE:Two programmed, encoded ignition keys must be available to start the vehicle. 1 Cut a new encoded PATS ignition lock cylinder key. | | | 2 | | | Does the theft LED illuminate for 3 seconds and then go out? Yes CLEAR the DTCs. CYCLE the ignition OFF then back to RUN to verify all codes have been cleared. CLEAR the DTCs. REPEAT the self-test. No | | F4: CHECK FOR A REPAIR MODULE MONITOR THE PCM PID SERV_MOD | | | 1 Monitor and record the PID/DATA. | | | 2 Monitor the PCM PID SERV_MOD. | | | Does the PCM PID SERV_MOD indicate YES? Yes No If the LED is illuminated continuously, REPEAT Step F3 using a new encoded ignition key.If the LED is flashing, RETRIEVE the PCM DTC stored for the new PATS fault. | Pinpoint Test G: The Engine Does Not Crank — the Anti-Theft LED Proves Out Normally Normal Operation During each vehicle start sequence, the PATS transceiver module reads the encoded ignition key identification code and circuit 168 (RD/BK) sends the data to the PCM. Possible Causes - PATS transceiver
- PCM
- encoded ignition key
- circuit 325 (DB/OG) open or shorted to power
| PINPOINT TEST G : THE ENGINE DOES NOT CRANK — THE ANTI-THEFT LED PROVES OUT NORMALLY | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | G1: CHECK THE STARTING SYSTEM FOR CORRECT VOLTAGE | | | 1 Key in OFF position. | | | 2 Disconnect: PCM C175b. | | | 3 Key in ON position. | | | 4 Measure the voltage between the PCM C175b-2, circuit 325 (DB/OG), harness side and ground. | | | Is the voltage less than 8 volts? Yes No | | G2: CHECK THE PCM FOR CORRECT OPERATION | | | 1 Disconnect all the PCM connectors. | | | 2 Check for: - corrosion
- pushed-out pins
| | | 3 Connect all the PCM connectors and make sure they seat correctly. | | | 4 Operate the system and verify the concern is still present. | | | Is the concern still present? Yes No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. | |
