928 GT V8-4957cc 5.0L (1989)

Electronic Spark Control Module: Technical Service Bulletins
Ignition Monitoring System - Diagnosis
July 7, 1992
Model
928 S4/GT/GTS
Group
2
Part Identifier
2880
Number
9203
Subject:
Diagnosing Ignition Monitoring System
ATTENTION:
Service Manager/Service Technician
Models Affected:
928 S4/GT/GTS
From 1989 Models ->
Concern:
Checking of components after activation of the ignition monitoring system (injection circuit switched off fault codes 1131 of 1231).
Activation may be caused by the following:
-
Damaged or defective exhaust gas temperature sensors.
-
Possible damage to the ignition coil wire left side (in driving direction) between the ignition coil and distributor cap.
-
Poor grounding of the mounting plate for the ignition final stages.
-
Poor physical connection of the electrical plugs on the ignition final stages.
Parts Information:
New version temperature sensor Part Number 928 606 155 02 New coil wire with hose covering Part Number 928 602 040 01 (for left side)
Repair Information:
1.
Check the left side ignition coil wire. Be certain the coil wire is routed freely and not under tension. If damaged, replace with new version (see
parts information).
2.
Check all ignition components and connectors for corrosion, tightness, correct connection and damage. Repair or replace as necessary. If an
ignition circuit has malfunctioned, an LED indication will be given by the ignition monitor relay located on the L-H control unit mounting plate.