PEC fuel injection and ignition system diagnosis fault memory

AD07.52-D-4000A

23.5.97

ENGINE 111.979 in MODEL 901, 902, 903, 904

	Fuel injection and ignition system PEC diagnosis, previous knowledge		AD07.52-D-2000A
Fault code	Fault text (HHT)	Possible cause/Note	Remedy
   	ECT sensor   –//– Implausible Loose contact	Cables, ECT sensor, control module	AD07.52-D-6000-01A
  	IAT sensor   –//– Loose contact	Cables, IAT sensor, control module	AD07.52-D-6000-02A
 	Intake manifold absolute pressure control module Implausible Missing	Vacuum line, control module	AD07.52-D-6000-03A
  	Idle contact Implausibly closed Loose contact Implausibly open	Cables, idle contact switch, throttle valve actuator motor	AD07.52-D-6000-28A
  	Throttle valve actual value potentiometer Implausibly high Implausibly low Loose contact	Cables, throttle valve actuator motor, control module	AD07.52-D-6000-05A
  	Drive actual value potentiometer Throttle valve Implausibly high Implausibly low Loose contact	Cables, throttle valve actuator motor, control module	AD07.52-D-6000-06A
  	Idle speed control On lower control stop On upper control stop in emergency-running mode	Leak air, throttle valve jams (possibly only temporarily), idle speed control in emergency-running mode Reset and re-activate control module memory	AD07.52-D-6000-07A
  	Oxygen sensor Sensor voltage too high Sensor, cold –//– Sensor signal implausible	Cables, oxygen sensor, control module	AD07.52-D-6000-08A
  	Oxygen sensor heating current Too low Too high  	Cables, oxygen sensor, control module	AD07.52-D-6000-09A
 	Lambda control rich stop/mixture Too lean Too rich	Leak air, fuel injection valves, diaphragm pressure regulator, wear on engine, faulty purging	AD07.52-D-6000-10A
 	Injection valve (cylinders 1 and 4)   +, thermal shut-off –//–,   –	Cables, injection valves	AD07.52-D-6000-11A
 	Injection valve (cylinders 2 and 3)   +, thermal shut-off –//–,   –	Cables, injection valves	AD07.52-D-6000-12A
 	Closed throttle position self-adaptation Too rich Too lean	Leak air, fuel injection valves, diaphragm pressure regulator, wear on engine, faulty purging	AD07.52-D-6000-13A
 	Part-load self-adaptation Too rich Too lean	Leak air, fuel injection valves, diaphragm pressure regulator, wear on engine, faulty purging	AD07.52-D-6000-14A
  	Ignition output stage 1 (cylinders 1 and 4)   + Misfire Current value not reached	Cables, spark plugs, ignition coil	AD07.52-D-6000-15A
  	Ignition output stage 2 (cylinders 2 and 3)   + Misfire Current value not reached	Cables, spark plugs, ignition coil	AD07.52-D-6000-16A
  	CKP sensor Not recognized/implausible Magnet missing Speed implausibly high	Cables, position sensor, magnet on flywheel segment	AD07.52-D-6000-17A
 	Reference resistor coupling   – –//–,   +	Reference resistor coupling	AD07.52-D-6000-18A
 	Speed signal TN output   –   +	Cable, control module	AD07.52-D-6000-19A
 	Vehicle speed signal Not recognized Implausibly high	Cable, control module	AD07.52-D-6000-20A
 	Fuel pump relay –//–,   +   –, thermal shut-off	Cables, relay	AD07.52-D-6000-21A
 	Purge control valve –//–,   +   –, thermal shut-off	Cable, switchover valve	AD07.52-D-6000-22A
	Short-term self-adaptation, closed throttle position/part load exceeded	Short-term fault in mixture preparation	AD07.52-D-6000-23A
	Control module Undervoltage	Cables, battery	AD07.52-D-6000-24A
   	Immobilizer (vehicles with drive authorization system) DAS –//–,   + DAS   – DAS disabled DAS implausible	Cable, incorrect attempt at starting, radio frequency remote control control module	AD07.52-D-6000-25A
 	Exhaust gas flap   + –//–,   –	Cable, switchover valve	AD07.52-D-6000-26A
 	K-factor Has been changed Signal implausible	Instrument cluster, K factor incorrect Check instrument cluster

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