AD - Spark Knock/Detonation

Description
This describes the operations necessary to diagnose a Spark Knock/Detonation symptom. This will involve checking the Ignition and ECM system.
Refer to "Symptom Matrix Chart" for details.

Diagnostic Repair Procedure
Check the following:
1. Battery and Alternator
2. Main power supply and ground circuits
3. Fuel quality
4. Base Idle speed, ignition timing and throttle position sensor adjustment: BASIC INSPECTION AND ADJUSTMENT
5. Target idle speed: Spec = 625 ± 50 RPM (A/T)/700 ± 50 RPM (M/T)
6. IACV-AAC Valve operation: Use CONSULT-II, ENGINE -ACTIVE TEST -IACV-AAC/V OPENING
7. EGR operation: P0400 - EGR SYSTEM
8. Fuel Pump and Fuel Pressure Regulator operation: Gauge should read 34 psi at idle and 43 psi when fuel pressure regulator vacuum hose is disconnected and plugged.
For inoperative Fuel Pump refer to FUEL PUMP CONTROL
9. Ignition signal: P1320 - IGNITION SIGNAL
10. Fuel Injectors: INJECTOR NON-DETECTABLE
11. Knock Sensor circuit: P0325 -KNOCK SENSOR

Use CONSULT-II to check the operation of the following items:
12. P0100 - MASS AIR FLOW SENSOR
13. P0131 - FRONT HEATED OXYGEN SENSOR
14. P0125 - ENGINE COOLANT TEMPERATURE SENSOR

Other items to be checked as possible malfunction cause
15. Engine mechanical components
16. ECM