Dodge Caliber. Manual — part 1036
*CHECKING THE ECM POWER AND GROUND CIRCUITS
PM
ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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Possible Causes
MAIN RELAY CONTROL CIRCUIT OPEN
MAIN RELAY OUTPUT CIRCUIT(S) OPEN
CHECKING THE MAIN RELAY SYSTEM
ECM GROUND CIRCUIT(S) OPEN
FUSED MAIN RELAY BATTERY SUPPLY CIRCUIT OPEN
FUSED IGNITION SWITCH (START) OUTPUT CIRCUIT OPEN
FUSED IGNITION SWITCH (START/RUN) OUTPUT CIRCUIT OPEN
SUBSTITUTE MAIN RELAY
MAIN RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
Diagnostic Test
1.
ECM GROUND CIRCUIT(S) OPEN
NOTE: Before checking the ECM Power and Grounds, check the Totally Integrated Power Module (TTIPM)
for DTC’s. Repair all TTIPM ignition switch or power supply related DTC’s before continuing with this test.
Turn the ignition off.
Disconnect the ECM harness connectors.
Using a 12-volt test light connected to 12-volts, check each of the ECM ground circuits in ECM harness connector
C1 cavities 1, 2 and 4.
Did the test light illuminate for each cavity?
Yes
>> Go To 2
No
>> Repair the ECM Ground circuit(s) for an open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
2.
FUSED IGNITION SWITCH START OUTPUT CIRCUIT OPEN
Turn the ignition to the Start position.
Using a 12-volt test light connected to ground, check the Fused Ignition Switch Start Output circuit in ECM harness
connector C1 cavity 86.
Is the test light on?
Yes
>> Go To 3
No
>> Repair the Fused Ignition Switch Start Output circuit for an open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
3.
FUSED IGNITION SWITCH START/RUN OUTPUT CIRCUIT OPEN
Turn the ignition to the Start position.
Using a 12-volt test light connected to ground, check the Fused Ignition Switch Start/Run Output circuit in ECM
harness connector C1 cavity 18.
Turn the ignition to the Run position.
Using a 12-volt test light connected to ground, check the Fused Ignition Switch Start/Run Output circuit in ECM
harness connector C1 cavity 18.
Is the test light on for both ignition switch positions?
Yes
>> Go To 4
No
>> Repair the Fused Ignition Switch Start/Run Output circuit for an open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
PM
4.
CHECKING THE MAIN RELAY SYSTEM
Turn the ignition off.
Connect a jumper wire between ground and the Main Relay Control circuit in ECM C1 harness connector cavity 49.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused Main Relay Output circuits at the ECM C1 harness
connector cavities 3, 5 and 6.
Does the test light illuminate brightly for each circuit?
Yes
>> Test Complete.
No
>> Go To 5
5.
FUSED MAIN RELAY BATTERY SUPPLY CIRCUIT OPEN
Turn the ignition off.
Remove the Main Relay.
Using a 12-volt test light connected to ground, check both Fused Main Relay Battery Supply circuits in Main Relay
connector.
Is the test light on?
Yes
>> Go To 6
No
>> Repair the Fused Main Relay Battery Supply circuit(s) for an open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
6.
MAIN RELAY OUTPUT CIRCUIT OPEN
Connect a jumper wire between cavity B7 and cavity B9 in the Main Relay connector.
Using a 12-volt test light connected to ground, check the Main Relay Output circuit in ECM harness connector C1
cavities 3, 5 and 6.
Did the test light illuminate for each circuit?
Yes
>> Go To 7
No
>> Repair the Main Relay Output circuit(s) for an open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
7.
MAIN RELAY
Turn the ignition off.
Install a known good relay in place of the Main Relay.
Connect a jumper wire between ground and the Main Relay Control circuit in ECM C1 harness connector cavity 49.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused Main Relay Output circuits at the ECM C1 harness
connector cavities 3, 5 and 6.
Did the test light illuminate brightly for each circuit?
Yes
>> Replace the Main Relay.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Go To 8
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1433
8.
MAIN RELAY CONTROL CIRCUIT OPEN
Turn the ignition off.
Remove the Main Relay.
Measure the resistance of the Main Relay Control circuit between the Main Relay connector and the ECM harness
connector.
Is the resistance below 10.0 ohms?
Yes
>> Go To 9
No
>> Repair the Main Relay Control circuit for an open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
9.
MAIN RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
Connect a jumper wire between cavity B7 and cavity B9 of the Main Relay connector.
Turn the ignition on.
Measure the voltage on the Main Relay Control circuit.
Is the voltage above 1.0 volt?
Yes
>> Repair the Main Relay Control circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Test Complete.
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
PM
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