Actuator Test Reference Table


Item No.
Inspection item
Drive content
Inspection conditions
Normal condition
Code No. /Inspection procedure No.
Reference page
1
Injector
Cut off No. 1 injector
Engine: After warm-up, idle operation (Cut off injectors sequentially to check for a cylinder that does not change engine in idle status.
Engine is changed (becomes unstable or stalled)
Code No. P0201

2
Cut off No. 2 injector
Code No. P0202

3
Cut off No. 3 injector
Code No. P0203

5
Fuel pump
Drive fuel pump to circulate fuel
Ignition switch: "ON"
Check for pump operating noise near fuel tank
Operating noise audible
Procedure No. 30

6
Purge control solenoid valve
Switch solenoid valve from OFF to ON
Ignition switch: "ON"
When the valve is actuated, operating noise is audible
Code No. P0443

7
Basic ignition timing
Switch Engine-ECU to ignition timing adjusting mode

  • Engine: Idle operation
  • Install timing light

5° BTDC
-
-
8
Radiator fan (Hi)
Drive the fan motor at high speed
Ignition switch: "ON"
Fan motor operates at high speed
Procedure No. 21

9
Radiator fan (Low)
Drive the fan motor at low speed
Ignition switch: "ON"
Fan motor operates at low speed
Procedure No. 21

10
Throttle valve control servo*
Stop the throttle valve control servo
Ignition switch: "ON"
Throttle valve is open slightly
Code No. P0638

13
A/C compressor relay
Switch the A/C compressor relay from OFF to ON
Ignition switch: "ON"
The operating sound of A/C compressor is audible
Procedure No. 31

14
Capacitor relay <Vehicles with AS&G system>
Switch the capacitor relay from OFF to ON

  • Disconnect the connectors of the engine-ECU.
  • Connect the special tool power plant ECU check harness (MB991987) between the disconnected connectors.
  • Ignition switch: "ON"

Measure the voltage between the earths of the terminal No.135. - Confirm the voltage is less than 1 V during the actuator test.
GROUP 54A - Radio With CD Player - Symptom Procedures - Inspection Procedure No. 2

note *: Turn the ignition switch OFF after the actuator driving is finished.