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Speed Control - Vehicles Built Up To: 10-2001 2.8L-1.9L Diesel, Vehicles With: Steering Wheel Speed Control Switches > < Speed Control - Vehicles Built From: 10-2002 2.8L-1.9L Diesel, Vehicles With: Steering Column Speed Control Switch

Galaxy 2000.75 (04.2000-02.2006)

Speed Control - Speed Control—Vehicles Built Up To: 10/2002 2.8L/1.9L Diesel, Vehicles With: Steering Column Speed Control Switch Galaxy 2000.75 (04/2000-02/2006)
Diagnosis and Testing

Refer to Wiring Diagrams Section 310-03, for schematic and connector information.

General Equipment
Worldwide Diagnostic System (WDS)

Principles of Operation

The 1.9L diesel and the 2.8L engine variant speed control systems are electronically controlled via the Powertrain Control Module (PCM).

Inspection and Verification

  1. Verify the customer concern.
  1. Visually inspect for obvious signs of electrical damage.

Visual Inspection Chart

Mechanical Electrical
  • Throttle body - vehicles with 2.8L engine
  • Fuse(s)
  • Wiring harness
  • Electrical connector(s)
  • Switch(es)
  • Throttle control unit - vehicles with 2.8L engine
  • Accelerator pedal position (APP) sensor
  • PCM
  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. If the concern is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu.
  1. Retrieve the Diagnostic Trouble Code (DTC)s and refer to the DTC Index Chart.
  1. If no DTC's are retrieved, proceed to the Symptom Chart to continue diagnosis.

Diagnostic Trouble Code (DTC) Index Chart

DTC Index Chart

Condition Possible Sources Action
DTC P0568 Speed control set signal
  • Speed control switch.
  • PCM.
  • GO to Pinpoint Test A. .

Symptom Chart

Symptom Chart

Symptom Possible Sources Action
The speed control is inoperative
*
Circuit(s).
*
Switch(es).
*
APP sensor.
*
PCM.
*
GO to Pinpoint Test A. .
*
Speed control switch.
*
CARRY OUT the speed control switch component test in this section.

Pinpoint Test

NOTE:
NOTE:Use a digital multimeter for all electrical measurements.

PINPOINT TEST A : THE SPEED CONTROL IS INOPERATIVE
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
A1: CHECK THE PEDAL POSITION SWITCHES AND SENSOR USING WDS
1
Using WDS check the operation of the clutch pedal position (CPP) switch (if equipped), brake pedal position (BPP) switch and APP sensor.

Are the pedal position switches and sensor working correctly?
Yes
GO to A2. .
No
The CPP switch is inoperative, GO to A6. . The BPP switch is inoperative (1.9L diesel engine), GO to A8. . The BPP switch is inoperative (2.8L engine), GO to A10. . The APP sensor is inoperative (1.9L diesel engine), GO to A12. . The APP sensor is inoperative (2.8L engine), GO to A13. .
A2: CHECK POWER TO THE SPEED CONTROL SWITCH
1
Disconnect Speed Control Switch C263.
2
Ignition switch in position II.

3
Measure the voltage between the speed control switch C263 pin 6, (BK) (1.9L diesel engine), pin 6, (BK/YE) (2.8L engine), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to A3. .
No
REPAIR the circuit. TEST the system for normal operation.
A3: CHECK THE SPEED CONTROL SWITCH OPERATION
1
Ignition switch in position 0.
2
Check the speed control switch for correct operation, refer to the speed control switch component test in the section.

Is the speed control switch operation ok?
Yes
Vehicles with 1.9L diesel engine, GO to A4. . Vehicles with 2.8L engine, GO to A5. .
No
INSTALL a new steering column multifuction switch. TEST the system for normal operation.
A4: CHECK THE SPEED CONTROL CIRCUITS FOR OPEN
1
Disconnect PCM C52b.

2
Measure the resistance between the following speed control switch C263 pins, harness side and PCM C52b pins, harness side:
  • C263, pin 2 (BU/GY) to C52b, pin 45 (BU/GY).
  • C263, pin 3 (RD) to C52b, pin 44 (RD).
  • C263, pin 4 (BK/WH) to C52b, pin 14 (BK/WH).
  • C263, pin 5 (GY) to C52b, pin 46 (GY).
  • C263, pin 7 (BK/WH) to C52b, pin 14 (BK/WH).

Are the resistances less than 5 ohms?
Yes
INSTALL a new PCM.
REFER to Powertrain Control Module (PCM) in this section.
TEST the system for normal operation.
No
REPAIR the circuit(s). TEST the system for normal operation
A5: CHECK THE SPEED CONTROL SWITCH TO PCM CIRCUITS FOR OPEN
1
Disconnect PCM C51b.

2
Measure the resistance between the following speed control switch C263 pins, harness side and PCM C51b pins, harness side:
  • C263, pin 2 (BU) to C51b, pin 75 (BU).
  • C263, pin 3 (BU/BN) to C51b, pin 57 (BU/BN).
  • C263, pin 4 (BK/WH) to C51b, pin 38 (BK/WH).
  • C263, pin 5 (BK/YE) to C51b, pin 76 (BK/YE).
  • C263, pin 7 (BK/WH) to C51b, pin 38 (BK/WH).

Are the resistances less than 5 ohms?
Yes
INSTALL a new PCM.
REFER to Powertrain Control Module (PCM) in this section.
TEST the system for normal operation.
No
REPAIR the circuit(s). TEST the system for normal operation
A6: CHECK POWER TO THE CLUTCH PEDAL POSITION SWITCH
1
Disconnect CPP Switch C356 (1.9L diesel engine).
2
Disconnect CPP Switch C154 (2.8L engine).
3
Ignition switch in position II.

4
Measure the voltage between the CPP switch C356 pin 1, (BK/YE) (1.9L diesel engine), harness side and ground or C154 pin 1, (BK) (2.8L engine), harness side and ground

Is the voltage greater than 10 volts?
Yes
GO to A7. .
No
REPAIR the circuit. TEST the system for normal operation.
A7: CHECK THE CPP SWITCH CIRCUIT FOR OPEN
1
Ignition switch in position 0.
2
Disconnect PCM C52b (1.9L diesel engine).
3
Disconnect PCM C51b (2.8L engine).

4
Measure the resistance between the CPP switch C356 pin 2, (WH/RD), harness side and PCM C52b pin 66, (WH/RD) (1.9L diesel engine), harness side or C154 pin 2, (BK/WH), harness side and PCM C51b pin 39, (BK/WH) (2.8L engine), harness side.

Is the resistance less than 5 ohms?
Yes
CHECK the CPP switch, refer to the wiring diagrams for additional information. INSTALL a new CPP switch as necessary. If the CPP switch is OK, INSTALL a new PCM.
REFER to Powertrain Control Module (PCM) in this section.
TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
A8: CHECK POWER TO THE BPP SWITCH
1
Disconnect BPP Switch C354.
2
Ignition switch in position II.

3
Measure the voltage between the BPP switch C354 pin 1, (RD/YE), harness side and ground and pin 2, (BK/YE), harness side and ground.

Are the voltages greater than 10 volts?
Yes
GO to A9. .
No
REPAIR the circuit(s). TEST the system for normal operation.
A9: CHECK THE BPP SWITCH CIRCUITS FOR OPEN
1
Ignition switch in position 0.
2
Disconnect PCM C52b.

3
Measure the resistance between the BPP switch C354, harness side and PCM C52b, harness side, between the following pins:
  • C354, pin 3 (WH/YE) to C52b, pin 65 (WH/YE).
  • C354, pin 4 (BK/RD) to C52b, pin 32 (BK/RD).

Are the resistances less than 5 ohms?
Yes
CHECK the BPP switch, refer to the wiring diagrams for additional information. INSTALL a new BPP switch as necessary. If the BPP switch is OK, INSTALL a new PCM.
REFER to Powertrain Control Module (PCM) in this section.
TEST the system for normal operation.
No
REPAIR the circuit(s). TEST the system for normal operation.
A10: CHECK POWER TO THE BPP SWITCH
1
Disconnect BPP switch C153.
2
Ignition switch in position II.

3
Measure the voltage between the BPP switch C153 pin 1, (RD/YE), harness side and ground and pin 2, (BK), harness side and ground.

Are the voltages greater than 10 volts?
Yes
GO to A11. .
No
REPAIR the circuit(s). TEST the system for normal operation.
A11: CHECK THE BPP SWITCH CIRCUITS FOR OPEN
1
Ignition switch in position 0.
2
Disconnect PCM C51b.

3
Measure the resistance between the BPP switch C153, harness side and PCM C51b, harness side, between the following pins:
  • C153, pin 3 (WH/YE) to C51b, pin 55 (WH/YE).
  • C153, pin 4 (BK/RD) to C51b, pin 56 (BK/RD).

Are the resistances less than 5 ohms?
Yes
CHECK the BPP switch, refer to the wiring diagrams for additional information. INSTALL a new BPP switch as necessary. If the BPP switch is OK, INSTALL a new PCM.
REFER to Powertrain Control Module (PCM) in this section.
TEST the system for normal operation.
No
REPAIR the circuit(s). TEST the system for normal operation.
A12: CHECK THE APP SENSOR CIRCUITS FOR OPEN
1
Disconnect APP sensor C56.
2
Disconnect PCM C52b.

3
Measure the resistance between the following APP sensor C56 pins, harness side and PCM C52b pins, harness side:
  • C56, pin 1 (GN/BN) to C52b, pin 63 (GN/BN).
  • C56, pin 2 (RD/BU) to C52b, pin 12 (RD/BU).
  • C56, pin 3 (GY/RD) to C52b, pin 50 (GY/RD).
  • C56, pin 4 (WH/BU) to C52b, pin 69 (WH/BU).
  • C56, pin 5 (BU/GY) to C52b, pin 36 (BU/GY).
  • C56, pin 6 (BN/BU) to C52b, pin 51 (BN/BU).

Are the resistances less than 5 ohms?
Yes
INSTALL a new APP sensor. TEST the system for normal operation. If the concern persists, INSTALL a new PCM.
No
REPAIR the circuit(s). TEST the system for normal operation.
A13: CHECK THE APP SENSOR CIRCUITS FOR OPEN
1
Disconnect APP sensor C56.
2
Disconnect PCM C51b.

3
Measure the resistance between the following APP sensor C56 pins, harness side and PCM C51b pins, harness side:
  • C56, pin 1 (WH) to C51b, pin 72 (WH).
  • C56, pin 2 (YE) to C51b, pin 73 (YE).
  • C56, pin 3 (RD) to C51b, pin 36 (RD).
  • C56, pin 4 (VT) to C51b, pin 35 (VT).
  • C56, pin 5 (GN) to C51b, pin 33 (GN).
  • C56, pin 6 (GY) to C51b, pin 34 (GY).

Are the resistances less than 5 ohms?
Yes
INSTALL a new APP sensor. TEST the system for normal operation. If the concern persists, INSTALL a new PCM.
No
REPAIR the circuit(s). TEST the system for normal operation.

Component Tests - Speed Control Switch

Remove the steering column multifunction switch, REFER to Section  211-05 Steering Column Switches.

NOTE:
NOTE:Use a digital multimeter for all electrical measurements.

Test 1

Switch the speed control switch to the ON position.

Measure resistance between pin 6 and pin 7.

Is the resistance lower than 1 ohm?

If yes, continue with Test 2.

If no, INSTALL a new steering column multifunction switch.

Test 2

Switch the speed control switch to the OFF position.

Measure resistance between pin 6 and pin 7.

Is the resistance greater than 10,000 ohms?

If yes, continue with Test 3.

If no, INSTALL a new steering column multifunction switch.

Test 3

Hold the speed control switch in the ACCELERATE position.

Measure resistance between pin 2 and pin 7.

Is the resistance less than 1 ohm?

If yes, continue with Test 4.

If no, INSTALL a new steering column multifunction switch.

Test 4

Switch the speed control switch to the ON position.

Measure resistance between pin 4 and pin 5.

Is the resistance less than 1 ohm?

If yes, continue with Test 5.

If no, INSTALL a new steering column multifunction switch.

Test 5

Hold the speed control switch in the SET/RESUME position.

Measure resistance between pin 3 and pin 7.

Is the resistance less than 1 ohm?

If yes, the speed control switch is OK.

If no, INSTALL a new steering column multifunction switch.

Speed Control - Vehicles Built Up To: 10-2001 2.8L-1.9L Diesel, Vehicles With: Steering Wheel Speed Control Switches > < Speed Control - Vehicles Built From: 10-2002 2.8L-1.9L Diesel, Vehicles With: Steering Column Speed Control Switch