Electronic Shift Module (Esm) - Electrical Diagnostics: Other Jeep Liberty II

Monitor Conditions

1. When Monitored: Continuously with the ignition in the run position.

Set Conditions

1. Set Condition: When monitored battery voltage drops below 6.0 volts.

Possible Causes

Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .

Scheme 322

Scheme 323

1. CHECK FOR ENGINE CHARGING SYSTEM DTCS With the scan tool, read Engine DTCs. Are there any Engine Charging System DTCs present? Yes Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure. Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure»(ref-350086-S21105755262009121400000) . No Go to step 2
2. CHECK (F1) IGNITION UNLOCK RUN START CIRCUIT Turn the ignition off to the lock position. Disconnect the Shift Lever Assembly harness connector. Turn the ignition on. Using a 12-volt test light connected to ground, check the (F1) Ignition Unlock Run Start circuit in the Shift Lever Assembly harness connector. NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly? Yes Go to step 3 No Repair the (F1) Ignition Unlock Run Start circuit for high resistance. Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure»(ref-350086-S21105755262009121400000) .
3. CHECK (Z910) GROUND CIRCUITS Turn the ignition off to the lock position. Using a 12-volt test light connected to 12-volts, check the (Z910) Ground circuit in the Shift Lever Assembly harness connector. NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly? Yes Go to step 4 Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure»(ref-350086-S21105755262009121400000) . No Repair the (Z910) Ground circuit for high resistance.
4. SHIFT LEVER ASSEMBLY Reconnect all disconnected harness connectors. With the scan tool, erase Shift Lever DTCs. Start the engine and raise the engine speed to 2000 rpm. With the scan tool, read Shift Lever DTCs. Did the DTC P0562-BATTERY VOLTAGE LOW DTC reset? Yes Replace the Shift Lever Assembly in accordance with the Service Information Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure»(ref-350086-S21105755262009121400000) . No Test Complete.

1. When Monitored: Continuously with the ignition in the run position.

1. Set Condition: When the monitored battery voltage rises above 16.0 volts.

Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure

1. When Monitored: Continuously with the ignition in the run position.

1. Set Condition: If the Shift Lever Assembly controller detects an invalid calibration (checksum value).

Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .

1. When Monitored: Continuously with the ignition in the run position.

1. Set Condition: The DTC will set if the high side driver detects a short to ground for 10 seconds.

Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .

Scheme 324

1. ENGINE DTCS PRESENT With the scan tool, read Engine DTCs. Are there any Engine brake DTCs present? Yes Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure. Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure»(ref-350086-S21105755262009121400000) . No Go to step 2
2. ABS MODULE DTCS PRESENT With the scan tool, read ABS Module DTCs. Are there any ABS DTCs present? Yes Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure. Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure»(ref-350086-S21105755262009121400000) . No Go to step 3
3. (L51) BRAKE SWITCH SIGNAL SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the Shift Lever Assembly harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between ground and the (L51) Brake Switch Signal circuit. Is the resistance below 5.0 ohms? Yes Repair the (L51) Brake Switch Signal for a short to ground. Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure»(ref-350086-S21105755262009121400000) . No Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention to all power and ground circuits. If no problems are found, replace the Shift Lever Assembly in accordance with the Service Information. Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure»(ref-350086-S21105755262009121400000) .

1. When Monitored: Continuously with the ignition in the run position.

1. Set Condition: The DTC will set if the high side driver detects an open load for 10 seconds.

Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .

Scheme 325

Scheme 326

1. ENGINE DTCs PRESENT With the scan tool, read Engine DTCs. Are there any Engine brake DTCs present? Yes Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure. Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure»(ref-350086-S21105755262009121400000) . No Go to step 2
2. ABS MODULE DTCs PRESENT With the scan tool, read ABS Module DTCs. Are there any ABS DTCs present? Yes Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure. Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure»(ref-350086-S21105755262009121400000) . No Go to step 3
3. (L51) BRAKE SWITCH SIGNAL OPEN Turn the ignition off to the lock position. Disconnect the Shift Lever Assembly harness connector. Disconnect the Stop Lamp Switch harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance of the (L51) Brake Switch Signal circuit between the Shift Lever Assembly harness connector and the Stop Lamp Switch. Is the resistance above 5.0 ohms? Yes Repair the (L51) Brake Switch Signal for an open. Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure»(ref-350086-S21105755262009121400000) . No Go to step 4
4. (L51) BRAKE SWITCH SIGNAL SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the Shift Lever Assembly harness connector. NOTE: Check connectors - Clean/repair as necessary. Turn the ignition on. Measure the voltage of the (L51) Brake Switch Signal circuit. Is the voltage above 0.5 volts? Yes Repair the (L51) Brake Switch Signal for a short to voltage. Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure»(ref-350086-S21105755262009121400000) . No Replace the Shift Lever Assembly in accordance with the Service Information. Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure»(ref-350086-S21105755262009121400000) .

1. When Monitored: Continuously with the ignition in the run position.

1. Set Condition: When the expected switch state is not correctly sensed by the Shift Lever Assembly. If the upshift switch signal is detected as active in gear position other than drive.

Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .

1. When Monitored: Continuously with the ignition in the run position and with the shift lever in AutoStick mode.

1. Set Condition: When the expected switch state is not correctly sensed by the Shift Lever Assembly (SLA) Electronic Shift Module (ESM). If the upshift switch signal is detected as active in gear position other than drive or both upshift and downshift signals are active at the same time.

Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure