Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSJEEP2009GRAND CHEROKEE LIMITED, 4.7 P, 4WDREPAIR AND DIAGNOSISENGINE PERFORMANCEIGNITION SYSTEM(FRONT CONTROL MODULE (FCM) - ELECTRICAL DIAGNOSTICS)DTC TROUBLESHOOTINGB211F-IGNITION RUN/ACC/PAD CONTROL CIRCUIT HIGHDIAGNOSTIC TEST

2009 Jeep Grand Cherokee Limited, 4.7 P, 4WD

Diagnostic Test

2009 Jeep Grand Cherokee Limited, 4.7 P, 4WDSECTION Diagnostic Test

CHECK FOR ACTIVE DTC
1. With the scan tool, read the active DTCs.
2. Cycle the ignition switch from off to on, leaving the ignition on for a minimum of 90 seconds.
3. 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 .
RUN/ACCESSORY DELAY RELAY
1. Turn the ignition off.
2. Install a substitute relay in place of the original Run/Accessory Delay Relay.
3. Cycle the ignition switch from off to on, leaving the ignition on for a minimum of 90 seconds.
4. With the scan tool, read the active FCM DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go to step 3
  No
  - Replace the original Run/Accessory Delay Relay.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(P305) ACCESSORY DELAY RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking Accessory Delay Relay Control Circuit Shorted To Voltage
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Remove the FCM from the Integrated Power Module.
3. Remove the Run/Accessory Delay Relay from the Junction Block.
4. Turn the ignition on.
5. Measure the voltage of the (P305) Accessory Delay Relay Control circuit at the relay connector (cavity 85).
  Is there any voltage present?
  
  Yes
  - Repair the (P305) Accessory Delay Relay Control circuit for a short to voltage.
  - 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 .

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.