Diagnostic Routine B
Diagnostic Routine B
Diagnostic Overview
Engine Does Not Crank (With Intelligent Access)
Refer to Wiring Diagram Set 20 for schematic and connector information Electrical Diagrams.
Refer to Wiring Diagram Set 90 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
When the start/stop switch is pressed in combination with the brake or clutch pedal (depending upon transmission), the RFA (Remote Function Actuator) module, BCM (Body Control Module) and PCM (Powertrain Control Module) receive signals to crank and start the engine. The PCM (Powertrain Control Module) and BCM (Body Control Module) receive notification from the TCM (Transmission Control Module) that the vehicle is in PARK or NEUTRAL (vehicles equipped with an automatic transmission) or from the Clutch Pedal Position (CPP) switch when the clutch pedal is fully applied (vehicles equipped with manual transmission). The PCM (Powertrain Control Module) supplies voltage and ground to the starter relay coil. The energized coil causes the starter relay contacts to close. This allows voltage to be supplied from the BJB (Battery Junction Box) to the starter solenoid coil. The starter solenoid coil is grounded at the starter motor. Energizing the starter solenoid closes the solenoid contacts allowing voltage directly from the battery to the starter motor, engaging the starter drive into the ring gear causing the engine to crank. The PCM (Powertrain Control Module) disengages the starter motor once an engine RPM (Revolutions Per Minute) threshold is reached, a set crank time is exceeded or the start/stop switch is pressed indicating an engine shutdown.
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
- Inspect the battery.
- Inspect the battery cables.
- Inspect high current BJB (Battery Junction Box) connections.
- Inspect BJB (Battery Junction Box) fuse 13 (30A).
- Inspect BCM (Body Control Module) fuse 78 (5A).
- Inspect the CPP (Clutch Pedal Position) switch (manual transmission only).
- Inspect the starter motor.
- Inspect the starter relay.
Special Tool(s)
Pinpoint Test
1. CHECK THE BATTERY
1. Check the battery condition and state of charge. REFER to Diagnostic Routine A: Battery Condition Test Pinpoint Tests.
Is the battery OK?
2. CHECK FOR NO KEY DETECTED MESSAGE IN THE MESSAGE CENTER
1. NOTE: There are certain areas inside the vehicle where the IA (Intelligent Access) key may not be detected and the message center displays No Key Detected. If the IA (Intelligent Access) key is in the far outside edges of the interior (in a door map pocket or above a sun visor) it may not be detected. Move the IA (Intelligent Access) key to a different location and try to start the vehicle again.
Check the message displayed in the message center while pressing the start/stop switch.
Is No Key Detected displayed?
3. CHECK THE IPC (Instrument Panel Cluster) OPERATION
1. Observe the IPC (Instrument Panel Cluster) operation while pressing the start/stop switch.
Do some indicators in the IPC (Instrument Panel Cluster) illuminate?
4. CHECK FOR COMMUNICATION WITH THE SCAN TOOL
1. Ignition ON.
2. Using a scan tool, perform the Network Test.
Does the BCM (Body Control Module), IPC (Instrument Panel Cluster) and RFA (Remote Function Actuator) module pass the Network Test?
5. RETRIEVE DTCs (Diagnostic Trouble Codes)
1. Ignition ON.
2. Using a scan tool, perform self-tests for:
- TCM (Transmission Control Module) (if equipped).
- RFA (Remote Function Actuator).
- BCM (Body Control Module).
- PCM (Powertrain Control Module).
Were DTCs (Diagnostic Trouble Codes) retrieved on-demand during self-test?
6. CHECK THE OPERATION OF THE STOPLAMPS
1. While observing the stoplamps, apply the brake pedal.
Do the stoplamps illuminate?
7. CHECK THE BRAKE PEDAL POSITION (BOO1) PID (Parameter Identification)
1. Using a scan tool, view the PCM (Powertrain Control Module) PIDs (Parameter Identifications).
2. Monitor the PCM (Powertrain Control Module) PID (Parameter Identification) BOO1 while applying the brake pedal.
Does the PID (Parameter Identification) read On?
8. CHECK THE BPP (Brake Pedal Position) SWITCH CIRCUIT FOR VOLTAGE AT THE PCM (Powertrain Control Module)
1. Ignition OFF.
2. Disconnect: PCM (Powertrain Control Module) C175B.
3. While applying the brake pedal, measure:
Is the voltage greater than 11 volts?
9. CHECK THE IN GEAR-TRANSMISSION IS APPLYING A LOAD TO ENGINE (IN_GEAR) PID (Parameter Identification)
1. Using a scan tool, view the PCM (Powertrain Control Module) PIDs (Parameter Identifications).
2. While observing the PCM (Powertrain Control Module) PID (Parameter Identification) IN_GEAR, place the gear selector in PARK and then NEUTRAL.
Does the PID (Parameter Identification) read No in both positions?
10. CHECK THE PARK/NEUTRAL CIRCUIT FOR A SHORT TO VOLTAGE
1. Ignition OFF.
2. Disconnect: PCM (Powertrain Control Module) C175B.
3. Disconnect: TCM (Transmission Control Module) C1750A.
4. Ignition ON.
5. Measure:
Is any voltage present?
11. CHECK THE PARK/NEUTRAL CIRCUIT FOR AN OPEN
1. Ignition OFF.
2. Measure:
Is the resistance less than 3 ohms?
12. CHECK THE TRANSMISSION RANGE INPUT ALLOWING ENGINE START (TR_CRANK) AND IN GEAR-TRANSMISSION IS APPLYING A LOAD TO ENGINE (IN_GEAR) PIDs (Parameter Identifications)
1. Connect: PCM (Powertrain Control Module) C175B.
2. Connect: TCM (Transmission Control Module) C1750A.
3. Ignition ON.
4. Using a scan tool, view the TCM (Transmission Control Module) PIDs (Parameter Identifications).
5. While observing the TCM (Transmission Control Module) PID (Parameter Identification) TR_CRANK, place the gear selector in PARK and then NEUTRAL.
6. Using a scan tool, view the PCM (Powertrain Control Module) PIDs (Parameter Identifications).
7. While observing the PCM (Powertrain Control Module) PID (Parameter Identification) IN_GEAR, place the gear selector in PARK and then NEUTRAL.
Does the TCM (Transmission Control Module) PID (Parameter Identification) TR_CRANK read YES and the PCM (Powertrain Control Module) PID (Parameter Identification) IN_GEAR read NO in both positions?
13. CHECK FOR DTC (Diagnostic Trouble Code) WITH TCM (Transmission Control Module) DISCONNECTED
1. Ignition OFF.
2. Disconnect: TCM (Transmission Control Module) C1750A.
3. Ignition ON.
4. Using a scan tool, perform PCM (Powertrain Control Module) self-test.
Was DTC (Diagnostic Trouble Code) P0851 retrieved on-demand during self-test?
14. CHECK THE PARK/NEUTRAL SWITCH CIRCUIT FOR A SHORT TO GROUND
1. Ignition OFF.
2. Disconnect: PCM (Powertrain Control Module) C175B.
3. Measure:
Is the resistance greater than 10,000 ohms?
15. CHECK THE CLUTCH PEDAL AT OR NEAR BOTTOM OF TRAVEL (CPP_BOT) PID (Parameter Identification)
1. Using a scan tool, view the PCM (Powertrain Control Module) PIDs (Parameter Identifications).
2. While observing the PCM (Powertrain Control Module) PID (Parameter Identification) CPP_BOT, fully apply the clutch pedal and release.
Does the PID (Parameter Identification) change from NO to YES when the clutch pedal is fully applied?
16. CHECK THE ENGINE CRANKING (ENG_CRANK) PID (Parameter Identification)
1. Using a scan tool, view the PCM (Powertrain Control Module) PIDs (Parameter Identifications).
2. NOTE: For manual transmission, fully apply the clutch pedal.
Make sure the transmission is in PARK or NEUTRAL.
3. While pressing the start/stop switch and the brake pedal, using a scan tool, monitor the PCM (Powertrain Control Module) PID (Parameter Identification) ENG_CRANK.
Does the PID (Parameter Identification) change from Inactive to Active?
17. CHECK THE STARTER RELAY CONTROL OPERATION
NOTICE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning of this system. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.
1. Remove the starter relay.
2. Measure:
3. NOTE: For manual transmission, fully apply the clutch pedal.
Make sure the transmission is in PARK or NEUTRAL.
4. While pressing the start/stop switch and the brake pedal, observe the test light.
Does the test light illuminate when the start/stop switch and brake pedal are pressed?
18. CHECK THE VOLTAGE TO THE STARTER RELAY
1. Ignition OFF.
2. Disconnect: Starter Relay.
3. Measure:
Is the voltage greater than 11 volts?
19. CHECK THE STARTER MOTOR OPERATION AT THE STARTER RELAY
1. Ignition OFF.
2. With the transmission in PARK or NEUTRAL, connect a fused jumper wire:
Did the starter engage and the engine crank?
20. CHECK THE BATTERY GROUND CABLES
1. Measure:
Are the voltages greater than 11 volts?
21. CHECK THE STARTER MOTOR GROUND
1. Measure:
Is the voltage greater than 11 volts?
22. CHECK THE VOLTAGE TO THE STARTER MOTOR
1. Measure:
Is the voltage greater than 11 volts?
23. CHECK THE STARTER MOTOR FOR CORRECT OPERATION
1. Ignition OFF.
2. With the transmission in PARK or NEUTRAL, momentarily connect a fused jumper wire:
Did the starter engage and the engine crank?
24. CHECK FOR START INPUT AT THE STARTER
1. Connect: Starter Relay.
2. Disconnect: Starter Solenoid C197B.
3. Press the start/stop switch and the brake or clutch pedal.
4. Measure:
Is the voltage greater than 11 volts?
25. CHECK THE PCM (Powertrain Control Module) STARTER RELAY CIRCUITS FOR A SHORT TO GROUND
1. Ignition OFF.
2. Disconnect: ACM (Audio Control Module) C240A.
3. Disconnect: PCM (Powertrain Control Module) C175B.
4. Measure:
Are the resistances greater than 10,000 ohms?
26. CHECK THE PCM (Powertrain Control Module) STARTER RELAY CIRCUITS FOR AN OPEN
1. Measure:
Are the resistances less than 3 ohms?
27. CHECK THE CRANK DETECT CIRCUIT FOR VOLTAGE AT THE PCM (Powertrain Control Module)
1. Ignition OFF.
2. Disconnect: PCM (Powertrain Control Module) C175B.
3. While pressing the start/stop switch, measure:
Is the voltage greater than 11 volts?
28. CHECK THE CPP (Clutch Pedal Position) SWITCH
1. Ignition OFF.
2. Disconnect: PCM (Powertrain Control Module) C175B.
3. While fully applying the clutch pedal, measure:
Is the resistance less than 3 ohms?
29. CHECK THE CPP (Clutch Pedal Position) GROUND CIRCUIT FOR AN OPEN
1. Disconnect: CPP (Clutch Pedal Position) Switch.
2. Measure:
Is the resistance less than 3 ohms?
30. CHECK THE CPP (Clutch Pedal Position) SWITCH CIRCUIT FOR AN OPEN
1. Measure:
Is the resistance less than 3 ohms?
31. CHECK FOR CORRECT PCM (Powertrain Control Module) OPERATION
1. Disconnect and inspect all PCM (Powertrain Control Module) connectors.
2. Repair:
- corrosion (install new connectors or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
3. Connect the PCM (Powertrain Control Module) connectors. Make sure they seat and latch correctly.
4. Operate the system and determine if the concern is still present.
Is the concern still present?
32. CHECK FOR CORRECT TCM (Transmission Control Module) OPERATION
1. Ignition OFF.
2. Disconnect and inspect all TCM (Transmission Control Module) connectors.
3. Repair:
- corrosion (install new connectors or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
4. Reconnect the TCM (Transmission Control Module) connectors. Make sure they seat and latch correctly.
5. Operate the system and determine if the concern is still present.
Is the concern still present?
33. CHECK FOR DTC (Diagnostic Trouble Code) WITH CPP (Clutch Pedal Position) SWITCH DISCONNECTED
1. Ignition OFF.
2. Disconnect: CPP (Clutch Pedal Position) Switch.
3. Ignition ON.
4. Using a scan tool, perform BCM (Body Control Module) self-test.
Was DTC (Diagnostic Trouble Code) P0833:23 retrieved during on-demand self-test with the CPP (Clutch Pedal Position) switch disconnected?
34. CHECK THE CLUTCH BOTTOM TRAVEL CIRCUIT FOR A SHORT TO GROUND
1. Ignition OFF.
2. Disconnect: BCM (Body Control Module) C2280A.
3. Disconnect: PCM (Powertrain Control Module) C175B.
4. Measure:
Is the resistance greater than 10,000 ohms?
35. CHECK FOR CORRECT BCM (Body Control Module) OPERATION
1. Ignition OFF.
2. Disconnect and inspect all BCM (Body Control Module) connectors.
3. Repair:
- corrosion (install new connectors or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
4. Reconnect the BCM (Body Control Module) connectors. Make sure they seat and latch correctly.
5. Reconnect the CPP (Clutch Pedal Position) switch.
6. Reconnect the PCM (Powertrain Control Module) C175B.
7. Operate the system and determine if the concern is still present.
Is the concern still present?
