Pinpoint Test

1. Ignition ON.
2. Verify there is an observable symptom present.

Is an observable symptom present? 

1. Yes: GO to 2  .
2. No: The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

1. Ignition ON.
2. Using a scan tool, perform a network test.

Does the ABS module pass the network test? 

1. Yes: GO to 3  .
2. No: REFER to DIAGNOSTIC ROUTINE B : The Anti-Lock Brake System (ABS) Module Does Not Respond To The Scan Tool.

1. Using a scan tool, perform the self-test on the following modules.
   • C-CM 
   • ABS module
   • PCM

Are any low or high voltage DTCs recorded? 

1. Yes: For the C-CM  , REFER to Diagnostic Routine Q: U3003:16 , or REFER to Diagnostic Routine R: U3003:17 .

   For ABS module, REFER to DIAGNOSTIC ROUTINE A : U3003:16, or REFER to DIAGNOSTIC ROUTINE P : U3003:17.

   For PCM, REFER to DIAGNOSTIC ROUTINE B : System Voltage Low or Battery is Discharged (DTC P0562), or REFER to DIAGNOSTIC ROUTINE A : System Voltage High (DTC P0563).

2. No: GO to 4  .

1. NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.

   Using a scan tool, clear the DTCs  .

2. Repeat the C-CM  self-test.

Is DTC U0121:00 still present? 

1. Yes: GO to 5  .
2. No: The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

1. Using a scan tool, clear all DTCs  .
2. Ignition OFF.
3. Wait 10 seconds.
4. Ignition ON.
5. Using a scan tool, perform Self-Test.
6. Retrieve the continuous memory DTCs  from all modules.

Do both the C-CM set DTC U0121:00 and the PCM set DTC U0129? 

1. Yes: INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE .
2. No: INSTALL a new C-CM  . REFER to Cruise Control Module (C-CM) .