CHECK AT THE ECU TERMINALS


TERMINAL VOLTAGE CHECK CHART

1.Disconnect the engine-ECU connectors B-08 and B-09, and connect check harness special tool MB992110 between the engine-ECU connectors.
2.Measure the voltage between each check harness connector terminal and check harness connector earth terminal (No. 81 or No. 93).
3.Connect a needle-nosed wire probe to a voltmeter probe.
4.Referring to the check sheet, insert the micromini probe into the check harness connector and measure the voltage.
note
  1. You may find it convenient to pull out the engine-ECU to make it easier to reach the connector terminals.
  2. The chart procedures do not have the particular order.
caution Short-circuiting the positive (+) probe between a connector terminal and earth could damage the vehicle wiring, the sensor, engine-ECU or all of them. Be careful to prevent this!
5.If voltmeter shows any division from standard value, check the corresponding sensor, actuator and related electrical wiring, then repair or replace.
6.After repair or replacement, recheck with the voltmeter to confirm that the repair has corrected the problem.
Terminal No.
 Inspection Item
 Check condition (Engine condition)
 Normal condition
1
 Intake oil feeder control valve
 Ignition switch: ON
 System voltage
Under the high load operation.
 4 - 10 V*1
2
 No. 1 injector
 Engine: While engine is idling after having warmed up, suddenly depress the accelerator pedal.
 From 9 - 13 V*1, it is slightly reduced temporarily.
3
 No. 2 injector
18
 No. 3 injector
19
 No. 4 injector
4
 Ignition coil No. 1
 Engine: 3,000 r/min
 0.1 - 2.0 V*1
5
 Ignition coil No. 2
20
 Ignition coil No. 3
21
 Ignition coil No. 4
6
 Starter active signal
 Engine: Cranking
 System voltage
Engine: Idling
 1 V or less
7
 Exhaust camshaft position sensor
 Engine: Cranking
 2.0 - 4.8 V*1
Engine: Idle operation
 2.0 - 3.0 V*1
8
 Crank angle sensor
 Engine: Cranking
 0.4 - 4.0 V*1
Engine: Idle operation
 2.0 - 3.0 V*1
9
 Sensor impressed voltage
 Ignition switch: ON
 System voltage
10
 Throttle position sensor (main)
  • Remove the intake air hose at the throttle body.
  • Disconnect the connector of the electronic-controlled throttle valve.
  • With the special tool test harness (MB991658) bridge only the mating terminals of No. 3, No. 4, No. 5, and No. 6 of the disconnected connectors.
  • Ignition switch: ON (engine stopped)

 Fully close the throttle valve with your finger.
 0.3 - 0.7 V
Fully open the throttle valve with your finger.
 4.0 V or more
11
 Throttle position sensor (sub)
  • Remove the intake air hose at the throttle body.
  • Disconnect the connector of the electronic-controlled throttle valve.
  • With the special tool test harness (MB991658) bridge only the mating terminals of No. 3, No. 4, No. 5, and No. 6 of the disconnected connectors.
  • Ignition switch: ON (engine stopped)

 Fully close the throttle valve with your finger.
 4.3 - 4.7 V
Fully open the throttle valve with your finger.
 0.3 - 0.7 V
12
 Applied voltage to the throttle position sensor
 Ignition switch: ON
 4.9 - 5.1 V
14
 Intake camshaft position sensor
 Engine: Cranking
 2.0 - 4.8 V*1
Engine: Idle operation
 2.0 - 3.0 V*1
15
 Throttle valve control servo (+)
  • Ignition switch: ON
  • Accelerator pedal: fully closed → fully opened

 Decreases slightly from the battery voltage
16
 Throttle valve control servo (-)
  • Ignition switch: ON
  • Accelerator pedal: fully closed → fully opened

 Decreases slightly from the battery voltage
17
 Exhaust oil feeder control valve
 Ignition switch: ON
 System voltage
Under the high load operation
 4 - 10 V*1
26
 Engine coolant temperature sensor
 Ignition switch: ON
 When engine coolant temperature is -20°C
 3.9 - 4.5 V
When engine coolant temperature is 0°C
 3.2 - 3.8 V
When engine coolant temperature is 20°C
 2.3 - 2.9 V
When engine coolant temperature is 40°C
 1.3 - 1.9 V
When engine coolant temperature is 60°C
 0.7 - 1.3 V
When engine coolant temperature is 80°C
 0.3 - 0.9 V
31
 Exhaust gas recirculation valve (A)
 Ignition switch: OFF → ON
 To initialize, energize exhaust gas recirculation valve for three seconds and de-energize it
32
 Exhaust gas recirculation valve (B)
47
 Exhaust gas recirculation valve (C)
48
 Exhaust gas recirculation valve (D)
34
 Oxygen sensor (front) heater
 Ignition switch: ON
 System voltage
Engine: Idling operation after warm-up (after 2 minutes has elapsed)
 13 V or less*1
35
 Oxygen sensor (rear) heater
 Ignition switch: ON
 System voltage
Engine: Idling operation after warm-up (after 2 minutes has elapsed)
 13 V or less*1
36
 Engine oil pressure switch
 Ignition switch: ON
 1 V or less
Engine: Idle operation
 System voltage
37
 Purge control solenoid valve
 Ignition switch: ON
 System voltage
Engine: 2,500 r/min after warm-up (with 4 minutes after the engine starting sequence is completed)
 Voltage decreases
38
 Oxygen sensor (front)
Engine: Maintain 2,500 r/min after warm-up
 0.5 <=> 1.4 V (repeat the alteration)
39
 Oxygen sensor (front) offset voltage
 Ignition switch: ON
 0.4 - 0.6 V
40
 Oxygen sensor (rear)
 Engine: After warm-up
  • Transmission: 2nd <M/T> or Ds range <CVT>
  • The engine speed is maintained to 3,500 r/min or more during an accelerated driving with the throttle full-open

 1.0 - 1.5 V
41
 Oxygen sensor (rear) offset voltage
 Ignition switch: ON
 0.4 - 0.6 V
44
 Applied voltage to the manifold absolute pressure sensor
 Ignition switch: ON
 4.9 - 5.1 V
45
 Manifold absolute pressure sensor
 Ignition switch: ON
 At 0 m altitude
 3.8 - 4.2 V
At 600 m altitude
 3.5 - 3.9 V
At 1,200 m altitude
 3.3 - 3.7 V
At 1,800 m altitude
 3.0 - 3.4 V
Engine: Idle operation after warm-up
 0.8 - 2.4 V
Engine: While the engine is idling after warm-up, quickly depress the accelerator pedal
 Varies depending on the negative pressure at the inlet manifold
58
 Power steering fluid pressure switch
 Engine: Idling after warm-up
 When steering wheel is stationary
 System voltage
When steering wheel is turned
 1 V or less
60
 Alternator G terminal
  • Engine: Idle operation after warm-up
  • Radiator fan: Non-operation
  • Head lamp switch: OFF → ON
  • Stop lamp: OFF → ON
  • Rear defogger switch: OFF → ON

 Voltage rises
61
 Alternator FR terminal
  • Engine: Idle operation after warm-up
  • Radiator fan: Non-operation
  • Head lamp switch: OFF → ON
  • Stop lamp: OFF → ON
  • Rear defogger switch: OFF → ON

 Voltage decreases
62
 Alternator L terminal
 Ignition switch: ON
 0.5 - 2.0 V
Engine: Idle operation
 System voltage
72
 Power supply voltage applied to throttle valve control servo
 Ignition switch: ON
 System voltage
73
 Engine control relay
 Ignition switch: LOCK (OFF)
 System voltage
Ignition switch: ON
 1 V or less
74
 Accelerator pedal position sensor (main)
 Ignition switch: ON
 Release the accelerator pedal
 0.9 - 1.1 V
Depress the accelerator pedal fully
 4.0 V or more
75
 Applied voltage to the accelerator pedal position sensor (main)
 Ignition switch: ON
 4.9 - 5.1 V
77
 Accelerator pedal position sensor (sub)
 Ignition switch: ON
 Release the accelerator pedal.
 0.4 - 0.6 V
Depress the accelerator pedal fully
 2.0 V or more
78
 Applied voltage to the accelerator pedal position sensor (sub)
 Ignition switch: ON
 4.9 - 5.1 V
82
 Power supply
 Ignition switch: ON
 System voltage
84
 Throttle valve control servo relay
 Ignition switch: LOCK (OFF)
 0 - 0.1 V
Ignition switch: ON
 1 V or less
87
 Air flow sensor
 Engine: Gradually increase the speed
 Voltage increase in response to revving
89
 Intake air temperature sensor
 Ignition switch: ON
 When the intake air temperature is -20°C
 3.8 - 4.4 V
When the intake air temperature is 0°C
 3.2 - 3.8 V
When the intake air temperature is 20°C
 2.3 - 2.9 V
When the intake air temperature is 40°C
 1.5 - 2.1 V
When the intake air temperature is 60°C
 0.8 - 1.4 V
When the intake air temperature is 80°C
 0.4 - 1.0 V
92
 Ignition switch - IG
 Ignition switch: ON
 System voltage
96
 Fuel pump relay
 Ignition switch: ON
 System voltage
Engine: Idle operation
 1 V or less
98
 Battery temperature sensor <4B11, 4B12-Except vehicles for Russia and FFV>
 Ignition switch: ON
 When the intake air temperature is -20°C
 3.8 - 4.4 V
When the intake air temperature is 0°C
 3.2 - 3.8 V
When the intake air temperature is 20°C
 2.3 - 2.9 V
When the intake air temperature is 40°C
 1.5 - 2.1 V
When the intake air temperature is 60°C
 0.8 - 1.4 V
When the intake air temperature is 80°C
 0.4 - 1.0 V
100
 Battery current sensor <4B11, 4B12-Except vehicles for Russia and FFV>
 The battery is being discharged.

  • Engine: Cranking
 The value changes by the value less than 3.5 V.
The battery is being charged.

  • Leave the ignition switch being in the ON position for several minutes, and then after the engine start.
 The value gradually increases from the value more than 3.5 V*2
102
 A/C compressor relay
  • Engine: Idle operation
  • A/C switch: OFF → ON
    (when the compressor is active)

 System voltage → 1 V or less.
104
 Backup power supply
 Ignition switch: LOCK (OFF)
 System voltage
105
 Ignition switch - ST
 Engine: Cranking
 System voltage
106
 Starter relay
 Engine: Cranking
 System voltage
Engine: Idle operation
 1 V or less
note *1: The shown voltage is the average value where an analog voltmeter is used (because a digital voltmeter may not be able to indicate the average voltage stably).
note *2: If the battery is fully charged, the output reading may be incorrect.


CHECK CHART FOR RESISTANCE AND CONTINUITY BETWEEN TERMINALS
1.Turn the ignition switch to "LOCK" (OFF) position.
2.Disconnect the engine-ECU connector.
3.Measure the resistance and check for continuity between the terminals of the engine-ECU harness-side connector while referring to the check chart.
note
  1. When measuring resistance and checking continuity, a harness for checking contact pin pressure should be used instead of inserting a test probe.
  2. Checking need not be carried out in the order given in the chart.
caution If the terminals that should be checked are mistaken, or if connector terminals are not correctly shorted to earth, damage may be caused to the vehicle wiring, sensors, engine-ECU and/or ohmmeter.
Be careful to prevent this!
4.If the ohmmeter shows any deviation from the standard value, check the corresponding sensor, actuator and related electrical wiring, and the repair or replace.
5.After repair or replacement, recheck with the ohmmeter to confirm that the repair or replacement has corrected the problem.


Terminal No.
 Inspection Item
 Standard value, normal condition (Check condition)
1 - 82
 Intake oil feeder control valve
 6.9 - 7.9 Ω (at 20°C)
15 - 16
 Throttle valve control servo
 0.3 - 100 Ω (at 20°C)
17 - 82
 Exhaust oil feeder control valve
 6.9 - 7.9 Ω (at 20°C)
26 - 27
 Engine coolant temperature sensor
 14 - 17 kΩ (at -20°C)
5.1 - 6.5 kΩ (at 0°C)
2.1 - 2.7 kΩ (at 20°C)
0.9 - 1.3 kΩ (at 40°C)
0.48 - 0.68 kΩ (at 60°C)
0.26 - 0.36 kΩ (at 80°C)
31 - 82
 Exhaust gas recirculation valve (A)
 20 - 24 Ω (at 20°C)
32 - 82
 Exhaust gas recirculation valve (B)
47 - 82
 Exhaust gas recirculation valve (C)
48 - 82
 Exhaust gas recirculation valve (D)
34 - 82
 Oxygen sensor (front) heater
 4.5 - 8.0 Ω (at 20°C)
35 - 82
 Oxygen sensor (rear) heater
 11 - 18 Ω (at 20°C)
37 - 82
 Purge control solenoid valve
 22 - 26 Ω (at 20°C)
71 - body earth
 ECU earth
 Continuity (2 Ω or less)
81 - body earth
83 - body earth
93 - body earth
88 - 89
 Intake air temperature sensor
 13 - 17 kΩ (at -20°C)
5.4 - 6.6 kΩ (at 0°C)
2.3 - 3.0 kΩ (at 20°C)
1.0 - 1.65 kΩ (at 40°C)
0.56 - 0.76 kΩ (at 60°C)
0.31 - 0.43 kΩ (at 80°C)
98 - 101
 Battery temperature sensor <4B11, 4B12-Except vehicles for Russia and FFV>
 4.9 - 5.3 kΩ (at 0°C)
2.2 - 2.6 kΩ (at 20°C)
1.0 - 1.4 kΩ (at 40°C)