| Diagnosis and Testing Inspection and Verification - Verify the customer concern by operating the system.
- Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection Chart | Mechanical | Electrical | | | - Fuse(s)
- Connections
- Wiring harness
- Clockspring
- Loose or corroded electrical connector(s)
- Speed control switch
- Brake pedal position (BPP) deactivation switch
- Clutch pedal position (CPP) deactivation Switch
- Powertrain control module (PCM)
- Central junction box (CJB)
| - If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
-
NOTE:Not all passenger junction box (PJB) variants support the speed control system. NOTE:If the PJB is configured for speed control disable, speed control operation is not transmitted, no Diagnostic Trouble Codes (DTCs) are generated. If the cause is not visually evident, verify the symptom and refer DTC index. - Connect the WDS to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the WDS menu.
Diagnostic Trouble Code (DTC) Index | DTC | Description | Possible Source | Action | | PCM - B1483 | BPP deactivation switch fault. | - BPP deactivation switch
- Instrument cluster.
| REFER to WDS. | | PCM - B2163 | CPP deactivation switch fault. | - CPP deactivation switch
- Instrument cluster.
| REFER to WDS. | | PJB - P0565 | Speed control ON Signal | On button failure short circuit | Make sure all speed control switch buttons are released. CHECK and CLEAR all current PJB DTCs. CYCLE ignition from OFF to ON. CARRY out PJB selftest. CHECK for PJB DTCs. If DTCs are found. GO to Pinpoint Test B. If no DTCs are found, TEST the system for normal operation. | | PJB - P0566 | Speed control OFF Signal | OFF button failure short circuit | Make sure all speed control switch buttons are released. CHECK and CLEAR all current PJB DTCs. CYCLE ignition from OFF to ON. CARRY out PJB selftest. CHECK for PJB DTCs. If DTCs are found. GO to Pinpoint Test B. If no DTCs are found, TEST the system for normal operation. | | PJB - P0567 | Speed control RESUME Signal | RESUME button failure short circuit | Make sure all speed control switch buttons are released. CHECK and CLEAR all current PJB DTCs. CYCLE ignition from OFF to ON. CARRY out PJB selftest. CHECK for PJB DTCs. If DTCs are found. GO to Pinpoint Test B. If no DTCs are found, TEST the system for normal operation. | | PJB - P0568 | Speed control SET + Signal | SET + button failure short circuit | Make sure all speed control switch buttons are released. CHECK and CLEAR all current PJB DTCs. CYCLE ignition from OFF to ON. CARRY out PJB selftest. CHECK for PJB DTCs. If DTCs are found. GO to Pinpoint Test B. If no DTCs are found, TEST the system for normal operation. | | PJB - P0569 | Speed control SET - Signal | SET - button failure short circuit | Make sure all speed control switch buttons are released. CHECK and CLEAR all current PJB DTCs. CYCLE ignition from OFF to ON. CARRY out PJB selftest. CHECK for PJB DTCs. If DTCs are found. GO to Pinpoint Test B. If no DTCs are found, TEST the system for normal operation. | | PJB - P0579 | Speed control multi-function input A circuit range/performance | Input circuit in -range failure | Make sure all speed control switch buttons are released. CHECK and CLEAR all current PJB DTCs. CYCLE ignition from OFF to ON. CARRY out PJB selftest. CHECK for PJB DTCs. If DTCs are found. GO to Pinpoint Test B. If no DTCs are found, TEST the system for normal operation. | | PJB - P0581 | Cruise control multi-function input A circuit high resistance | Input circuit open circuit failure | Make sure all speed control switch buttons are released. CHECK and CLEAR all current PJB DTCs. CYCLE ignition from OFF to ON. CARRY out PJB selftest. CHECK for PJB DTCs. If DTCs are found. GO to Pinpoint Test B. If no DTCs are found, TEST the system for normal operation. | - If the DTCs retrieved are not related to the concern, verify the symptom and refer to the Symptom Chart.
Symptom Chart | Symptom | Possible Sources | Action | | The speed control is inoperative | * Parking brake control switch * Parking brake | * Check the alignment and function of the parking brake lever and parking brake control switch. INSTALL new parts as necessary. TEST the system for normal operation. | | * BPP deactivation switch. | * Check the BPP switch for correct operation. REFER to WDS. | | * CPP deactivation switch. | * Check the BPP switch for correct operation. REFER to WDS. | | * Speed control switch. * Clockspring. | * | | * PCM. | * REFER to: Electronic Engine Controls (303-14B Electronic Engine Controls - 2.5L Duratec-RS (VI5)/2.5L Duratec-ST (VI5), Diagnosis and Testing). | | * Speed control switch. | * | | * PCM. | * REFER to: Electronic Engine Controls (303-14B Electronic Engine Controls - 2.5L Duratec-RS (VI5)/2.5L Duratec-ST (VI5), Diagnosis and Testing). | | * Faulty communication between the modules - MS CAN bus | * REFER to: Electronic Engine Controls (303-14B Electronic Engine Controls - 2.5L Duratec-RS (VI5)/2.5L Duratec-ST (VI5), Diagnosis and Testing). | | * Faulty communication between the modules - HS CAN bus | * REFER to: Electronic Engine Controls (303-14B Electronic Engine Controls - 2.5L Duratec-RS (VI5)/2.5L Duratec-ST (VI5), Diagnosis and Testing). | | The speed control does not disengage when the brake pedal is applied | * BPP deactivation switch. | * REFER to WDS. | | * PCM. | * REFER to: Electronic Engine Controls (303-14B Electronic Engine Controls - 2.5L Duratec-RS (VI5)/2.5L Duratec-ST (VI5), Diagnosis and Testing). | | The speed control does not disengage when the clutch pedal is applied | * CPP deactivation switch. | * REFER to WDS. | | * PCM. | * REFER to: Electronic Engine Controls (303-14B Electronic Engine Controls - 2.5L Duratec-RS (VI5)/2.5L Duratec-ST (VI5), Diagnosis and Testing). | | PINPOINT TEST A : THE SPEED CONTROL SWITCH READING IS INOPERATIVE | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | A1: CHECK THE SPEED CONTROL CIRCUIT FOR CORRECT OPERATION | | | 1 Disconnect CJB C103. | | | 2 Measure the resistance between the CJB C103 pin 18, circuit 8-PG13 (WH), harness side and CJB C103 pin 10, circuit 9-PG13 (BN), harness side. | | | Is the resistance between 2088 and 2143 ohms? Yes No | | A2: CHECK THE SPEED CONTROL SWITCH OFF BUTTON FOR CORRECT OPERATION | | | 1 Measure the resistance between the CJB C103 pin 18, circuit 8-PG13 (WH), harness side and CJB C103 pin 10, circuit 9-PG13 (BN), harness side with the speed control switch in the OFF position. | | | 2 Press and hold the speed control switch in the OFF position. | | | Is the resistance less than 5 ohms? Yes No INSTALL a new speed control switch.
REFER to: Speed Control Switch (310-03 Speed Control, Removal and Installation).
TEST the system for normal operation. | | A3: CHECK THE SPEED CONTROL SWITCH SET - BUTTON FOR CORRECT OPERATION | | | 1 Measure the resistance between the CJB C103 pin 18, circuit 8-PG13 (WH), harness side and CJB C103 pin 10, circuit 9-PG13 (BN), harness side with the speed control switch in the SET - position. | | | 2 Press and hold the speed control switch in the SET - position. | | | Is the resistance between 118 and 129 ohms? Yes No INSTALL a new speed control switch.
REFER to: Speed Control Switch (310-03 Speed Control, Removal and Installation).
TEST the system for normal operation. | | A4: CHECK THE SPEED CONTROL SWITCH SET + BUTTON FOR CORRECT OPERATION | | | 1 Measure the resistance between the CJB C103 pin 18, circuit 8-PG13 (WH), harness side and CJB C103 pin 10, circuit 9-PG13 (BN), harness side with the speed control switch in the SET + position. | | | 2 Press and hold the speed control switch in the SET + position. | | | Is the resistance 297 and 318 ohms? Yes No INSTALL a new speed control switch.
REFER to: Speed Control Switch (310-03 Speed Control, Removal and Installation).
TEST the system for normal operation. | | A5: CHECK THE SPEED CONTROL SWITCH RESUME BUTTON FOR CORRECT OPERATION | | | 1 Measure the resistance between the CJB C103 pin 18, circuit 8-PG13 (WH), harness side and CJB C103 pin 10, circuit 9-PG13 (BN), harness side with the speed control switch in the RESUME position. | | | 2 Press and hold the speed control switch in the RESUME position. | | | Is the resistance between 594 and 616 ohms? Yes No INSTALL a new speed control switch.
REFER to: Speed Control Switch (310-03 Speed Control, Removal and Installation).
TEST the system for normal operation. | | A6: CHECK THE SPEED CONTROL SWITCH ON BUTTON FOR CORRECT OPERATION | | | 1 Measure the resistance between the CJB C103 pin 18, circuit 8-PG13 (WH), harness side and CJB C103 pin 10, circuit 9-PG13 (BN), harness side with the speed control switch in the ON position. | | | 2 Press and hold the speed control switch in the ON position. | | | Is the resistance between 1098 and 1134 ohms? Yes CLEAR the DTCs. TEST the system for normal operation. No INSTALL a new speed control switch.
REFER to: Speed Control Switch (310-03 Speed Control, Removal and Installation).
TEST the system for normal operation. | | PINPOINT TEST B : CHECK SPEED CONTROL SWITCH CIRCUITS FOR HIGH RESISTANCE | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | B1: CHECK THE SPEED CONTROL CIRCUIT 9-PG13 (BN) FOR RESISTANCE | | | 1 Disconnect Clockspring C896. | | | 2 Measure the resistance between the CJB C103 pin 10, circuit 9-PG13 (BN), harness side and the clockspring C896 pin 4, circuit 9-PG13 (BN), harness side. | | | Is the resistance less than 5 ohms? Yes No REPAIR the circuit. TEST the system for normal operation. | | B2: CHECK THE SPEED CONTROL CIRCUIT 8-PG13 (WH) FOR RESISTANCE | | | 1 Measure the resistance between the CJB C103 pin 18, circuit 8-PG13 (WH), harness side and the clockspring C896 pin 5, circuit 8-PG13 (WH), harness side. | | | Is the resistance less than 5 ohms? Yes No REPAIR the circuit. TEST the system for normal operation. | | B3: CHECK THE SPEED CONTROL OFF SWITCH FOR CORRECT OPERATION | | | WARNING:To deactivate the air bag module, refer to the procedure in Section 501-20B for the correct air bag module deactivation procedure. Failure to follow this instruction may result in personal injury. 1 Remove the driver air bag module.
REFER to: Driver Air Bag Module - Vehicles Built Up To: 06/2004 (501-20B, Removal and Installation) /
Driver Air Bag Module - Vehicles Built From: 06/2004 (501-20B, Removal and Installation).
| | | 2 Disconnect Speed control switch C921. | | | 3 Measure resistance between the speed control switch C921 pin 2, and pin 3, harness side. | | | 4 Press and hold the speed control switch in the OFF position. | | | Is the resistance less than 5 ohms? Yes No INSTALL a new speed control switch.
REFER to: Speed Control Switch (310-03 Speed Control, Removal and Installation).
TEST the system for normal operation. | | B4: CHECK THE SPEED CONTROL SET - SWITCH FOR CORRECT OPERATION | | | 1 Measure resistance between the speed control switch C921 pin 2, and pin 3, harness side. | | | 2 Press and hold the speed control switch in the SET - position. | | | Is the resistance between 119 and 127 ohms? Yes No INSTALL a new speed control switch.
REFER to: Speed Control Switch (310-03 Speed Control, Removal and Installation).
TEST the system for normal operation. | | B5: CHECK THE SPEED CONTROL SET + SWITCH FOR CORRECT OPERATION | | | 1 Measure resistance between the speed control switch C921 pin 2, and pin 3, harness side. | | | 2 Press and hold the speed control switch in the SET + position. | | | Is the resistance 299 and 312 ohms? Yes No INSTALL a new speed control switch.
REFER to: Speed Control Switch (310-03 Speed Control, Removal and Installation).
TEST the system for normal operation. | | B6: CHECK THE SPEED CONTROL RESUME SWITCH FOR CORRECT OPERATION | | | 1 Measure resistance between the speed control switch C921 pin 2, and pin 3, harness side. | | | 2 Press and hold the speed control switch in the RESUME position. | | | Is the resistance between 597 and 616 ohms? Yes No INSTALL a new speed control switch.
REFER to: Speed Control Switch (310-03 Speed Control, Removal and Installation).
TEST the system for normal operation. | | B7: CHECK THE SPEED CONTROL SWITCH ON BUTTON FOR CORRECT OPERATION | | | 1 Measure resistance between the speed control switch C921 pin 2, and pin 3, harness side. | | | 2 Press and hold the speed control switch in the ON position. | | | Is the resistance between 1103 and 1133 ohms? Yes INSTALL a new clockspring.
REFER to: Clockspring - Vehicles Built Up To: 06/2004 (501-20B, Removal and Installation) /
Clockspring - Vehicles Built From: 06/2004 (501-20B, Removal and Installation).
TEST the system for normal operation. No INSTALL a new speed control switch.
REFER to: Speed Control Switch (310-03 Speed Control, Removal and Installation).
TEST the system for normal operation. | |
