CHECK AT THE ECU TERMINALS


1.Disconnect the engine-ECU connectors, 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 (GNDB or GNDE).
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 VOLTAGE CHECK CHART




Terminal No.
 Terminal code
 Inspection Item
 Check condition (Engine condition)
 Normal condition
1
 OCV
 Oil feeder control valve
 Engine: Idling operation after warm-up
 System voltage
Engine: 5,000 r/min
 1 V or less → 4.0 - 10 V*(After a few seconds pass)
2
 INJ1
 No. 1 injector
 Engine: While engine is idling after having warmed up, suddenly depress the accelerator pedal.
 From 9 - 14 V*, it is slightly reduced temporarily.
3
 INJ2
 No. 2 injector
18
 INJ3
 No. 3 injector
19
 INJ4
 No. 4 injector
50
 INJ5
 No. 5 injector
51
 INJ6
 No. 6 injector
4
 CIL1
 Ignition coil No. 1
 Engine: 3,000 r/min
 0.3 - 3.0 V*
5
 CIL2
 Ignition coil No. 2
20
 CIL3
 Ignition coil No. 3
21
 CIL4
 Ignition coil No. 4
52
 CIL5
 Ignition coil No. 5
53
 CIL6
 Ignition coil No. 6
6
 NTSW
 Starter active signal
 Engine: Cranking
 System voltage
Engine: Idling
 1.0 V or less
7
 OFRE
 Right bank oxygen sensor (front) offset voltage
 Ignition switch: ON
 0.4 - 0.6 V
8
 SGT
 Crank angle sensor
 Engine: Cranking
 0.4 - 4.0 V*
Engine: Idle operation
 2.0 - 3.0 V*
9
 5V
 Sensor impressed voltage
 Ignition switch: ON
 System voltage
10
 TPSM
 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
 TPSS
 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.
 4.0 V or more
Fully open the throttle valve with your finger.
 1.0 V or less
12
 TPS5
 Applied voltage to the throttle position sensor
 Ignition switch: ON
 4.9 - 5.1 V
14
 SGC
 Camshaft position sensor
 Engine: Cranking
 0.4 - 4.0 V*
Engine: Idle operation
 2.5 - 3.9 V*
15
 ETV+
 Throttle valve control servo (+)
  • Ignition switch: ON
  • Accelerator pedal: fully opened → fully closed

 Decreases slightly (Approximately 2 V) from the battery voltage
16
 ETV-
 Throttle valve control servo (-)
  • Ignition switch: ON
  • Accelerator pedal: fully closed → fully opened

 Decreases slightly (Approximately 2 V) from the battery voltage
22
 O2FR
 Right bank oxygen sensor (front)
 Engine: Maintain 2,500 r/min after warm-up
 0.5 <=> 1.4 V (repeat the alteration)
26
 WTS
 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
 EGRA
 Exhaust gas recirculation valve (A)
 Ignition switch: OFF → ON
 To initialise, energise exhaust gas recirculation valve for three seconds and de-energise it
32
 EGRB
 Exhaust gas recirculation valve (B)
47
 EGRC
 Exhaust gas recirculation valve (C)
48
 EGRD
 Exhaust gas recirculation valve (D)
33
 OHFR
 Right bank oxygen sensor (front) heater
 Engine: Idling operation after warm-up (after 15 seconds has elapsed)
 9 - 11 V*
Under the high load operation
 9 - 11 V* → System voltage
34
 OHFL
 Left bank oxygen sensor (front) heater
 Engine: Idling operation after warm-up (after 15 seconds has elapsed)
 9 - 11 V*
Under the high load operation
9 - 11 V* → System voltage
35
 OHRL
 Left bank oxygen sensor (rear) heater
 Engine: Idling operation after warm-up (after 15 seconds has elapsed)
 1.0 V or less
Under the high load operation
 System voltage
36
 OPSW
 Engine oil pressure switch
 Ignition switch: ON
 1.0 V or less
Engine: Idle operation
 System voltage
37
 PURG
 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
40
 O2RL
 Left bank oxygen sensor (rear)
  • Transmission: 2nd
  • 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
 ORLE
 Left bank oxygen sensor (rear) offset voltage
 Ignition switch: ON
 0.4 - 0.6 V
44
 MAP5
 Applied voltage to the manifold absolute pressure sensor
 Ignition switch: ON
 4.9 - 5.1 V
45
 MAP
 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
 0.6 - 1.4 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
49
 OHRR
 Right bank oxygen sensor (rear) heater
 Engine: Idling operation after warm-up (after 15 seconds has elapsed)
 1.0 V or less
Under the high load operation
 System voltage
54
 O2RR
 Right bank oxygen sensor (front)
  • Transmission: 2nd
  • 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
55
 ORRE
 Right bank oxygen sensor (front) offset voltage
 Ignition switch: ON
 0.4 - 0.6 V
57
 O2FL
 Left bank oxygen sensor (front) offset voltage
 Engine: Maintain 2,500 r/min after warm-up
 0.5 <=> 1.4 V (repeat the alteration)
58
 OFLE
 Left bank oxygen sensor (front) offset voltage
 Ignition switch: ON
 0.4 - 0.6 V
60
 ALTG
 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
 ALTF
 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
 ALTL
 Alternator L terminal
 Ignition switch: ON
 0.5 - 2.0 V
Engine: Idle operation
 System voltage
72
 RSB
 Power supply voltage applied to throttle valve control servo
 Ignition switch: ON
 System voltage
73
 C/R
 Engine control relay
 Ignition switch: LOCK (OFF)
 System voltage
Ignition switch: ON
 1.0 V or less
74
 APSM
 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
 APS5
 Applied voltage to the accelerator pedal position sensor (main)
 Ignition switch: ON
 4.9 - 5.1 V
77
 APSS
 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
 5VV
 Applied voltage to the accelerator pedal position sensor (sub)
 Ignition switch: ON
 4.9 - 5.1 V
82
 BAT1
 Power supply
 Ignition switch: ON
 System voltage
84
 C/RL
 Throttle valve control servo relay
 Ignition switch: ON → LOCK (OFF)
 1.0 V or less → System voltage → 1.0 V or less
87
 AFS
 Air flow sensor
 Engine: Gradually increase the speed
 Voltage increase in response to revving
89
 ATS
 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
 IGN
 Ignition switch - IG
 Ignition switch: ON
 System voltage
96
 FP/R
 Fuel pump relay
 Ignition switch: ON
 System voltage
Engine: Idle operation
 1.0 V or less
102
 AC/R
 A/C compressor relay
  • Engine: Idle operation
  • A/C switch: OFF → ON
    (when the compressor is active)

 System voltage → 1.0 V or less
104
 BACK
 Backup power supply
 Ignition switch: LOCK (OFF)
 System voltage
105
 ST
 Ignition switch - ST
 Engine: Cranking
 8 V or more
106
 STRL
 Starter relay
 Engine: Cranking
 System voltage
Engine: Idle operation
 1.0 V or less
note *: The shown voltage is the average value where an analogue voltmeter is used (because a digital voltmeter may not be able to indicate the average voltage stably).

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.
 Terminal code
 Inspection Item
 Standard value, normal condition (Check condition)
1 - 82
 DCV - BAT1
 Oil feeder control valve
 6.9 - 7.9 Ω (at 20°C)
15 - 16
 ETV+ - ETV-
 Throttle valve control servo
 0.3 - 80 Ω (at 20°C)
26 - 27
 WTS - WTSE
 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
 EGRA - BAT1
 Exhaust gas recirculation valve (A)
 20 - 24 Ω (at 20°C)
32 - 82
 EGRB - BAT1
 Exhaust gas recirculation valve (B)
47 - 82
 EGRC - BAT1
 Exhaust gas recirculation valve (C)
48 - 82
 EGRD - BAT1
 Exhaust gas recirculation valve (D)
33 - 82
 OHFR - BAT1
 Right bank oxygen sensor (front) heater
 4.5 - 8.0 Ω (at 20°C)
34 - 82
 OHFL - BAT1
 Left bank oxygen sensor (front) heater
 4.5 - 8.0 Ω (at 20°C)
35 - 82
 OHRL - BAT1
 Left bank oxygen sensor (rear) heater
 11 - 18 Ω (at 20°C)
37 - 82
 PURG - BAT1
 Purge control solenoid valve
 22 - 26 Ω (at 20°C)
49 - 82
 OHRR - BAT1
 Right bank oxygen sensor (rear) heater
 11 - 18 Ω (at 20°C)
71 - body earth
 RSG - body earth
 ECU earth
 Continuity (2 Ω or less)
81 - body earth
 GNDB - body earth
83 - body earth
 RSH - body earth
93 - body earth
 GNDE - body earth
88 - 89
 AFSE - ATS
 Intake air temperature sensor
 13 - 17 kΩ (at -20°C)
5.3 - 6.7 kΩ (at 0°C)
2.3 - 3.0 kΩ (at 20°C)
0.30 - 0.45 kΩ (at 80°C)
note *: The value in square brackets is only advisory.