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ECM TERMINALS AND REFERENCE VALUE
NGEC0569
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than the ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM CONDITION DATA (DC Voltage)
4 OR/B ECM relay (Self-shutoff)
[Engine is running]
[Ignition switch OFF]
쐌 For a few seconds after turning ignition switch
OFF
0 - 1.5V
[Ignition switch OFF]
쐌 A few seconds passed after turning ignition switch
OFF
BATTERY VOLTAGE
(11 - 14V)
10 B/R ECM ground
[Engine is running]
쐌 Idle speed
Engine ground
19 B/R ECM ground
[Engine is running]
쐌 Idle speed
Engine ground
24 W/L Ignition switch
[Ignition switch OFF] 0V
[Ignition switch ON]
BATTERY VOLTAGE
(11 - 14V)
25 B/Y ECM ground
[Engine is running]
쐌 Idle speed
Engine ground
32 B/Y ECM ground
[Engine is running]
쐌 Idle speed
Engine ground
(Probe this terminal with
(−) tester probe when
measuring)
67 B/P
Power supply for ECM [Ignition switch ON]
BATTERY VOLTAGE
(11 - 14V)
72 B/P
80 SB Power supply (Back-up) [Ignition switch OFF]
BATTERY VOLTAGE
(11 - 14V)
116 B/R ECM ground
[Engine is running]
쐌 Idle speed
Engine ground
117 B/P Current return
[Engine is running]
쐌 Idle speed
BATTERY VOLTAGE
(11 - 14V)
124 B/R ECM ground
[Engine is running]
쐌 Idle speed
Engine ground
DIAGNOSTIC PROCEDURE
NGEC0570
1 INSPECTION START
Start engine.
Is engine running?
YesorNo
Yes 䊳 GO TO 6.
No 䊳 GO TO 2.
TROUBLE DIAGNOSIS FOR POWER SUPPLY
VG33E
Main Power Supply and Ground Circuit (Cont’d)
EC-734
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