Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING
Diagnostic Trouble Code Troubleshooting
Caution
• When attaching the tester lead to the PCM, the SST must be used. Refer to 01-40B PCM
INSPECTION [KL].
DTC B1318 ABS control module power supply
DESCRIPTION Voltage sensor detects low voltage
POSSIBLE
CAUSE
• Malfunction of generator
• Malfunction of related wiring harness
• Depleted battery
STEP INSPECTION ACTION
1
With engine idling, is battery terminal voltage
okay?
Yes Make sure that battery terminal connection is okay.
Go to next step.
No Charge or replace battery.
2
Are generator and drive belt tension okay?
d
- 0 1 -1 7 GENERATOR INSPECTION
Yes Go to next step.
No
Adjust drive belt tension as necessary.
Replace generator and/or drive belt as necessary.
3
Is DTC for engine control system obtained?
c r 0 1 -0 1 B ENGINE ON-BOARD DIAGNOSIS
Yes Follow inspection procedures for engine control system.
No Go to next step.
4
Inspect connection of Z (power supply) and D
(ground) connector pins for ABS CM.
Is it okay? Yes Go to next step.
No Repair ABS CM connector.
5
Is voltage of ABS CM harness between Z and D
above 10 V when engine is idling?
Yes Go to next step.
No Go to step 7.
6
With IG SW OFF, is resistance between D of ABS
CM harness and secure ground
less than 5 £2?
Yes Go to next step.
No Repair harness between D and ground point for open
circuit.
7 Remove ABS, A/B fuse (10 A). Is resistance
between Z of ABS CM harness and secure
ground
less than 10 kii?
Yes Repair harness between Z and J/B fuse box for short to
ground.
No Go to next step.
8
Is resistance between Z of ABS CM harness and
ABS, A/B fuse (10 A) less than 5 ii?
Yes Go to next step.
No Repair harness between Z and fuse for open circuit.
9 Erase DTC and recheck for DTC with engine is
idling.
Is DTC B1318 obtained?
Yes Replace ABS CM.
No There was a temporarily low battery voltage.
DTC B1342 ABS control module
DESCRIPTION
The on-board diagnostic program detects computer malfunction
POSSIBLE
CAUSE
• M alfunction of control m odule
STEP
INSPECTION
ACTION
— — —
Replace ABS CM.
DTC B1484 Brake switch harness
DESCRIPTION
When open circuit detected in following harnesses
• Between brake switch and ABS CM
• Between ABS CM and brake light
POSSIBLE
CAUSE
• Malfunction of related wiring harness
STEP INSPECTION
ACTION
1 Inspect harness between brake light and
ABS
CM.
• Open circuit
Is harness normal?
Yes Go to next step.
No Repair harness.
0 4 -0 1 -7