TROUBLE DIAGNOSES — Diagnostic Procedure 12 — Control Unit or Power Supply and Ground Circuit
BR-59flowchartDiagnostic Procedure 12
Diagnostic Procedure 12 — control unit or power supply / ground
1
INSPECTION START
2
[A] CHECK CONTROL UNIT POWER SUPPLY. Disconnect control unit connector. Check voltage between control unit connector (vehicle side) terminal ⑴ and body ground with ignition switch turned on.
N.G.
Check if control unit "10A" fuse is blown.
O.K.
3
[B] CHECK ALTERNATOR L TERMINAL VOLTAGE. Disconnect control unit connector. Check voltage between control unit connector (vehicle side) terminal ⑮ and body ground after engine starting. Voltage: 6 V or more.
N.G.
Check if other warnings activate.
O.K.
4
[C] Check continuity between control unit connector (vehicle side) terminal ⑳ and body ground with ignition switch "OFF".
N.G.
Repair ground harness.
O.K.
5
Replace control unit.
| Specification | Value |
|---|---|
| Control unit power supply[A] Terminal 1 vs body ground, ignition ON. | 12V (battery voltage) |
| Alternator L terminal voltage[B] Terminal 15 vs body ground, after engine start. | 6 or moreV |
| Ground continuity[C] Terminal 20 vs body ground, ignition OFF. | ≈ 0Ω |
Control unit power supply[A] Terminal 1 vs body ground, ignition ON.
12V (battery voltage)
Alternator L terminal voltage[B] Terminal 15 vs body ground, after engine start.
6 or moreV
Ground continuity[C] Terminal 20 vs body ground, ignition OFF.
≈ 0Ω