Mazda CX-9 Grand Touring 2009 Manual page 1154

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
terminal RC (wiring harness-side) and
PCM terminal 2S (wiring harness-side).
6
Is there continuity?
INSPECT BATTERY POSITIVE
TERMINAL FOR POOR INSTALLATION
Turn the engine switch off.
7
Inspect the battery positive terminal for
looseness.
Is there any malfunction?
INSPECT GENERATOR CIRCUIT FOR
OPEN CIRCUIT
Inspect the continuity between generator
8
terminal B (wiring harness-side) and
battery positive terminal (wiring
harness-side)
Is there continuity?
VERIFY TROUBLESHOOTING OF DTC
P0626 HAS BEEN COMPLETED
Verify that all disconnected connectors
reconnected.
Clear the DTC from the PCM memory
9
using the M-MDS.
Perform the KOEO or KOER self-test
using the M-MDS. (See KOEO/KOER
SELF TEST [MZI-3.7].)
Is the PENDING CODE for the DTC
present?
VERIFY AFTER REPAIR PROCEDURE
Perform the "AFTER REPAIR
10
PROCEDURE". (See AFTER REPAIR
PROCEDURE [MZI-3.7].)
Are any DTCs present?
DTC P0642 [MZI-3.7]
DTC P0642 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P0642
DETECTION
CONDITION
2008 Mazda CX-9 Grand Touring
Sensor reference voltage circuit low
Indicates the reference voltage circuit is lower than reference voltage
minimum.
Repair or replace suspected part, then go to
No
Connect the battery positive terminal
Yes
correctly, then go to Step 9.
No Go to the next step.
Yes Go to the next step.
Repair or replace suspected part, then go to
No
the next step.
Replace the PCM, then go to the next step.
Yes (See PCM REMOVAL/INSTALLATION
[MZI-3.7] .)
No Go to the next step.
Go to the applicable DTC inspection. (See
Yes
DTC TABLE [MZI-3.7].)
No Troubleshooting completed.
Step 9.