Mazda Mazda6 Workshop Manual Supplement page 327

STEP INSPECTION
5 Is there continuity between PCM GND terminals
65, 85, 103, 104 and GND?
6 Measure voltage between PCM GND terminals
65, 85, 103, 104 and coil terminal C.
Is the voltage below 1.0?
7 Turn engine switch to ON.
Access VPWR PID.
Is VPWR PID okay?
Specification
Battery voltage
8 Disconnect coil connector.
Turn engine switch to ON.
Is there battery voltage at coil connector terminal
D (harness-side)?
9 Is there continuity between PCM terminal 57 and
starter relay?
10 Inspect following:
• Battery connection
• Battery condition
• Fuses
Are all items okay?
11 Is clicking sound heard from starter when engine
switch is turned to START?
12 Inspect starting system.
Is starting system okay?
13 Do any other electrical accessories work?
14 Connect WDS or equivalent to DLC-2.
Turn engine switch to ON.
Retrieve any DTC.
Is DTC displayed?
15 Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM. (See
End Of Sie
TROUBLESHOOTING
RESULTS
Yes Go to next step.
No Repair or replace wiring harness.
Yes Go to next step.
No Repair or replace wiring harness.
Yes Go to next step.
No Repair or replace wiring harness.
Yes Inspect for following:
• Open or short circuit between coil terminal A and
• Open or short circuit between coil terminal B and
No Repair or replace wiring harness between coil
connector terminal D and fuse panel.
Yes Go to next step.
No Repair replace wiring harness.
Yes Go to next step.
No Service as necessary.
Repeat Step 10.
Yes Go to Step 13.
No Go to next step.
Yes Inspect for seized/hydrolocked engine, flywheel.
No Repair or replace components as required.
Yes Go to next step.
No Inspect charging system.
Yes DTC is displayed:
Go to appropriate DTC test.
Communication error message is displayed:
Inspect for following:
• Open circuit between PCM control relay and PCM
• Open circuit PCM control relay and PCM terminal
• PCM control relay stuck open
• Open or poor GND circuit (PCM terminal 65, 85,
• Poor connection vehicle body GND
No No DTC is displayed:
Inspect for following:
• START circuit in engine switch
• Open circuit between engine switch and starter
F2–64 PCM REMOVAL/INSTALLATION)
ACTION
PCM terminal 80
PCM terminal 28
terminal 53 or 79
69
103 or 104)
F2
F2–175