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 MANUALSCHEVROLET1999CAMARO BASE, 2D CONVERTIBLE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P1273-P1536DTC P1377DTC P1377: IGNITION CONTROL (IC) MODULE CAM PULSE TO 4X REFERENCE PULSE (4.0L "G" BODY & 4.6L "E" & "K" BODIES)DIAGNOSTIC PROCEDURES
1999 Chevrolet Camaro Base, 2D Convertible, Automatic
Diagnostic Procedures
1999 Chevrolet Camaro Base, 2D Convertible, AutomaticSECTION Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
- If any other DTCs are present, diagnose affected DTC(s) first. If no other DTCs are present, go to next step.
- If this DTC is set along with a driveability complaint, go to next step. If DTC is not set along with a driveability complaint, fault is not present, see DIAGNOSTIC AIDS .
- This DTC will set when are too many or too few cam or 4X pulses. Check for Electromagnetic Interference (EMI) being induced in the fuel control circuit, cam signal circuit or camshaft position sensor circuits by improper spark plug wire routing or high power transmitter operating in the vicinity. Correct any causes of EMI. If EMI is not present, go to next step.
- Check for intermittent short to ground, circuit shorted together or open in fuel control circuit, cam signal circuit or camshaft position sensor circuits. Repair as necessary. If circuits are okay, go to next step.
- Check terminal contacts at camshaft position sensor terminals. Repair as necessary. If terminal contacts are okay, go to next step.
- Check terminal contact at camshaft position sensor to IC module. Check terminal contact at fuel control circuit and cam signal circuit to PCM. Repair as necessary. If terminal contacts are okay, fault is not present. See DIAGNOSTIC AIDS .
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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.