Mazda 6 2002 Workshop Manual page 228

Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has FREEZE FRAME DATA been recorded?
2 VERIFY RELATED SERVICE INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related Service Information available?
3 VERIFY CKP SENSOR VOLTAGE
• Disconnect CKP sensor connector.
• Connect voltmeter between CKP sensor
connector terminals A and B (sensor-side).
• Inspect the voltage in AC range while cranking
the engine.
• Is any voltage reading?
4 INSPECT POOR CONNECTION OF CKP
SENSOR CONNECTOR
• Verify that the CKP sensor connector is
connected securely.
• Is connector okay?
5 INSPECT CKP CIRCUIT FOR SHORT TO
POWER
• Turn ignition key OFF
• Disconnect CKP sensor connector.
• Turn ignition key ON (Engine OFF).
• Measure voltage between following terminals
— CKP sensor terminal A
— CKP sensor terminal B
• Is any voltage reading?
6 INSPECT CKP CIRCUIT FOR SHORT TO
GROUND
• Inspect continuity between following terminal
and body ground:
— CKP sensor connector terminal A (harness-
side)
— CKP sensor connector terminal B (harness-
side)
• Is there any continuity?
7 INSPECT CKP CIRCUITS FOR SHORTS
• Inspect continuity between CKP sensor
connector terminals A and B (harness-side).
• Is there any continuity?
8 INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunction?
9 INSPECT CKP CIRCUIT FOR OPEN
• Inspect continuity between following circuits:
— CKP sensor terminal A (harness-side) and
PCM terminal 2D (harness-side)
— CKP sensor terminal B (harness-side) and
PCM terminal 2G (harness-side)
• Is there continuity?
10 INSPECT CKP SENSOR
• Turn ignition key to OFF.
• Perform CKP sensor inspection.
(See F–54 CRANKSHAFT POSITION (CKP)
SENSOR INSPECTION)
• Is CKP sensor okay?
ON-BOARD DIAGNOSTIC
INSPECTION
Yes Go to net step.
No Record FREEZE FRAME DATA on repair order, then go to
net step.
Yes Perform repair or diagnosis according to available Service
Information.
• If vehicle is not repaired, go to net step.
No Go to net step.
Yes Go to net step.
No Go to step 10.
Yes Go to net step.
No Reconnect the connector, then go to Step 11.
Yes Repair or replace suspected harness, then go to Step 11.
No Go to net step.
Yes Repair or replace suspected harness, then go to Step 11.
No Go to net step.
Yes Repair or replace suspected harness, then go to Step 11.
No Go to net step.
Yes Repair terminal, then go to Step 11.
No Go to net step.
Yes Go to Step 11.
No Repair or replace suspected harness, then go to Step 11.
Yes Go to net step.
No Inspect CKP sensor pulse wheel for damage. Replace CKP
sensor pulse wheel and go to net step.
ACTION
F–131
F