Many malfunctions in the electrical system are caused by poor harness(s) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Check the following conditions:
Check for damaged harness and terminals: contact resistance, oxidation, bent or broken terminals.
Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection
Use a suitable male pin to ensure that contact in sockets is good. The pin should remain in position when pulled gently.
Has a problem been found?
YES
Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
System OK.
IG KEY : ON. Engine: OFF.
BRAKE SWITCH Connector C31 : Disconnect.
Measure Voltage between C31 Terminal 2 and GND.
Channel1 Prove(+) : C31 Terminal 2 (Harness side)
Channel1 Prove(-) : Chassis GND.
Specification :approx.0V
Is measured value 12V?
YES
Go to Signal inspection
NO
Go to Component Inspection
IG KEY : OFF. Engine : OFF.
PCM Connector C33-2 :Disconnect , BRAKE SWITCH Connector C31 : Disconnect
Measure resistance between PCM C31 Terminal 1 and C31 Terminal 2.
Specification : ∞Ω
Disconnect each ECU Connector with installed ABS and ECS and then Measure
Is measured value ∞Ω ?
YES
verify line open to power supply Line.
NO
Verify Line short between C31 2 to PCM C33-2 18 and C31 1 power supply Line
Repair, go to Verification of Vehicle Repair
If it is normal, Line Which is inputed to ABS and ECS is Short from Power Line.Therefore,Repair ,check for Line or Jointor M9 Connector.
