1.1.2 Unstable idle speed 7 The indicator lamp of glow plug is on for 3.5 s. After the engine is started, switch the start switch from ST (start) to ON. If the relay of glow plug keeps closed for less than 14 s, it indicates something is wrong with the quick start timer. Replace the quick start timer Switch the start switch from OFF to ON. If the relay of glow plug keeps closed for less than 14 s, it indicates something is wrong with the quick start timer. Replace the quick start timer Temperature switch The temperature switch is broken. Replace the temperature switch Connectivity of glow plug The connectivity of glow plug is bad. Replace the glow plug The glow plug is power off.
The indicator lamp of glow plug is off. The fuse of indicator lamp blows out. Replace the broken fuse Quick start timer The quick start timer is broken. Replace the quick start timer The indicator lamp of glow plug is on for 3.5 s. The glow plug relay is broken. When the start switch is switched from OFF to ON, the glow plug relay is not switched on. Replace the glow plug relay The quick start timer is broken. Replace the quick start timer A line fault occurs in the circuit of glow plug relay. Repair or replace corresponding line(s) The fuse blows out or there is a line fault. When the start switch is switched from OFF to ON, the glow plug relay is switched on.
Replace the fuse or corresponding line(s) Check Causes Remedies Idle speed system The idle speed is not proper. Adjust the idle speed High idle speed control device The high idle speed control device is broken. Repair or replace the high idle speed control device. Throttle control system The adjustment of throttle control system is not proper. Adjust the throttle control system Fuel system Leakage or blockage occurs in the fuel system. Repair or replace the fuel system There is air in the fuel system. Release the air from the fuel system There is water in the fuel system. Replace the fuel