Diagnostic Test

WARNING: This page is about a different car, the 2009 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read the active DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go to step 2
  No
  - If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
STARTER RELAY
1. Turn the ignition off.
2. Remove the Starter Relay.
3. Turn the ignition on.
4. With the scan tool, read the active FCM DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go to step 4
  No
  - Replace the Starter Relay.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
ENGINE CONTROL MODULE (ECM)
1. Turn the ignition off.
2. Disconnect the ECM C2 harness connector.
3. Turn the ignition on.
4. With the scan tool, read the active FCM DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go to step 4
  No
  - Replace the Engine Control Module in accordance with the Service Information.
  - Perform the ECM VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
(F26) IGNITION SWITCH OUTPUT (START) CIRCUIT SHORTED TO GROUND

Fig 1: Checking Ignition Switch Output (Start) Circuit Shorted To Ground
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the FCM C1 harness connector.
3. Measure the resistance between ground and the (F26) Ignition Switch Output (Start) circuit at the FCM C1 harness connector.
  Is the resistance below 100.0 Ohms?
  
  Yes
  - Repair the (F26) Ignition Switch Output (Start) circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If OK, replace and program the Front Control Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .