Mazda 626 Station Wagon, Workshop Manual

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ON-BOARD DIAGNOSTIC
STEP INSPECTION ACTION
3 INSPECT POOR CONNECTION OF
IMMOBILIZER UNIT CONNECTOR
• Turn ignition key to OFF.
• Disconnect immobilizer unit connector.
• Check for poor connection (damaged,
pulled-out terminals, corrosion, etc.).
• Are there any malfunctions?
Yes Repair or replace terminals, then go to Step 19.
No Go to next step.
4 INSPECT GROUND CIRCUIT OF IMMOBILIZER
UNIT FOR OPEN
• Measure resistance between immobilizer unit
terminal B (harness-side) and body ground.
• Is there any continuity?
Yes Go to next step.
No Repair or replace harness, then go to Step 19.
5 INSPECT COIL TERMINAL
• Disconnect coil connector.
• Check for bent terminals.
• Are there any malfunctions?
Yes Repair or replace terminals, then go to Step 19.
No Go to next step.
6 INSPECT COIL FOR SHORT CIRCUIT
• Check continuity between coil terminal A
(part-side) and body ground.
• Is there any continuity?
Yes Replace coil, then go to Step 19.
No Go to next step.
7 INSPECT COIL CIRCUIT FOR SHORT
• Connect coil connector.
• Check continuity between immobilizer unit
terminal F (harness-side) and body ground.
• Is there any continuity?
Yes Repair or replace harness, then go to Step 19.
No Go to next step.
8 INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Disconnect PCM connector.
• Check for poor connection (damaged,
pulled-out terminals, corrosion, etc.).
• Are there any malfunctions?
Yes Repair or replace harness, then go to Step 19.
No Go to next step.
9 INSPECT COMMUNICATION UNE FOR OPEN
CIRCUIT
• Measure continuity between immobilizer unit
terminal A (harness-side) and PCM terminal
66.
• Is there any continuity?
Yes Go to step 19.
No Repair or replace harness, then go to Step 19.
10 CLASSIFY MALFUNCTION BY ANOTHER
DETECTED DTC
• Has DTC P1602 been detected?
Yes Go to Step 14.
No Go to next step.
11 INSPECT POOR CONNECTION OF COIL
CONNECTOR
• Disconnect coil connector.
• Check for poor connection (damaged,
pulled-out terminals, corrosion, etc.).
• Are there any malfunctions?
Yes Repair or replace harness, then go to Step 19.
No Go to next step.
12 INSPECT COIL FOR OPEN
• Disconnect coil connector.
• Measure resistance between coil terminals
(part-side).
• Is there any continuity?
Yes Go to next step.
No
Replace coil, then go to Step 19.
13 INSPECT COIL CIRCUIT FOR OPEN
• Connect coil connector.
• Measure the resistance between immobilizer
connectors F and D (harness-side).
• Is there any continuity?
Yes Go to Step 19.
No Repair or replace harness, then go to Step 19.
14 CLASSIFY MALFUNCTION BY ANOTHER
DETECTED DTC
• Has immobilizer unit DTC 03 been detected?
Yes Key has not transponder, change to registered key.
Then go to Step 19.
No Go to next step.
15 CLASSIFY MALFUNCTION BY ANOTHER
DETECTED DTC
• Has immobilizer unit DTC 01 been detected?
Yes Ignition key is not registered.
Reprogram key or using another registered key, then
go to next step.
(See Section T)
No Go to next step.
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