Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK THE BATTERY CONDITION
1. Using the approved Midtronics Battery tester, check the Battery condition.
  Did the Battery pass the load test?
  
  Yes
  - Go To 2
  No
  - Replace the Battery and retest.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .
CHECK FOR AN ACTIVE DTC
1. Test drive the vehicle and perform several auto starts of the engine.
2. With the scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 3
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE (T760) IN-RUSH RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the PDC C4 harness connector.
3. Disconnect the ICR Relay C1 harness connector.
4. Check for continuity between ground and the (T760) In-Rush Relay Control circuit at the ICR Relay C1 harness connector.
  Is there continuity between ground and the (T760) In-Rush Relay Control circuit?
  
  Yes
  - Repair the (T760) In-Rush Relay Control circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .
  No
  - Go To 4
CHECK THE (T760) IN-RUSH RELAY CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (T760) In-Rush Relay Control circuit between the In-Rush Current Relay and the PDC C4 harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Repair the (T760) In-Rush Relay Control circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .
  No
  - Go To 5
CHECK THE IN-RUSH CURRENT RELAY FOR PROPER OPERATION
1. Reconnect the PDC C4 harness connector.
2. Turn the ignition on.
3. Remove the (A8) Fused Battery Cable from the In-Rush Current Relay.
4. Remove the (A8) Battery Starter Feed Cable from the In-Rush Current Relay.
  NOTE:
  These are live Battery Feeds. Be careful to insulate and/or isolate the cable so that it cannot make contact with any engine ground.
5. Measure the resistance across the terminals of the In-Rush Current Relay.
  NOTE:
  The relay is normally closed when not energized and therefore not passing through the resistor inside the relay.
6. While continuing to measure the resistance across the terminals of the relay, supply 12 volts to the terminal that the (T760) In-Rush Relay Control circuit connects to at the In-Rush Current relay. When the 12 volt supply is removed, the resistance should change back to below 2.0 Ohms if the relay is not stuck open.
  NOTE:
  This will energize the relay which will open the direct path and cause the current to flow through the internal resistor.
  
  Did the resistance change from below 2.0 Ohms to significantly higher when the In-Rush Current Relay was energized?
  
  Yes
  - The In-Rush Current Relay is not stuck closed at this time. This may be an intermittent condition. Try energizing and de-energizing the relay several times while testing continuity across the relay to check for an intermittent stuck condition.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .
  No
  - Replace the In-Rush Current Relay in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .