Diagnostic Notes (Read Before Proceding)

NOTE: When using diagnostic charts, begin with TC-1A CODE TO TC TEST CHART (Checking For Trouble Codes)

This section includes all the information needed to diagnose Powertrain Control Module (PCM) problems. Included are;

- Trouble Code (TC) Tests
Manufacturer Code Charts

- No Start (NS) Tests
No Start (NS) Tests

- No Trouble Code (NTC) Tests
No Trouble Code (NTC) Tests

- Speed Control (SC) System Tests
Speed Control (SC) Tests

- Charging (CH) System Tests
Charging System (CH) Tests

- Verification (VER) Tests
Verification Tests

The Diagnostic Charts are based on the trouble condition or symptom being present at the time of diagnosis.

When replacement or repairs are required, see Service & Repair for the proper procedure.

Diagnostic procedures change, and new diagnostic systems may be added or enhanced. FAMILIARIZE YOURSELF WITH THIS SECTION BEFORE TRYING TO DIAGNOSE A VEHICLE TROUBLE CODE.

TROUBLESHOOTING PROCEDURE

NOTE: All diagnosis should include these six steps;

1. Verify Complaint
2. Check for Related Symptoms
3. Analyze Problem
4. Isolate Problem
5. Repair Problem
6. Verify Proper Operation