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CAC Gasoline Engine Maintenance And Servicing Manual 106 5.malfaction, cause and correction Malfuction cause Correction Fuel pump. fuel check for operation by CHECK—UP1 Tachometer Check wring, sensor resistance and installation of the sensor. Dual relays Check for function, connector connection and blown fuse. Vehicle cannot start 35——pin Check for the wiring connection to ECU. Difficult to start; idling speed too high or too low Engine idling speed control solenoid. check for solenoid operation and 4—pin connection by warning light on During idling, λsensor Check for the wiring, proper sensor tightening torque and the warning light on for a long time Diagnosis Check for the signal wiring grounding. warning light doesn’t turn on Diagnosis The bulb is broken or circuit is open Rough idling at high temperature. Throttle valve sensor or water the throttle valve opening angle and water temperature signal Rough idling at low temperature. coolant The temperature indicated should be in the vicinity of the Idle intermittent wave 1—throttle 1.check the throttle valve cable for proper adjustment, smooth Idling speed fluctuates continuously at high temperature. 1.throttle valve body 1.2 seal vacuum connection
1. check the above item 1,2,3 for intermittent idling speed recirculation passages, which are connected to the throttle valve body and intake manifold. Vehicle performance deteriorates 1—fuel supply 1. Check for fuel supply. If fuel pressure is 1±0.1bar, it is ok; |