z
For DTC P0155, measure the resistance
between PCM terminal 2E and front
HO2S (LH) terminal A.
z
For DTC P0161, measure the resistance
between PCM terminal 2AO and rear
HO2S (LH) terminal A.
z
Is the resistance less than 5.0 ohms?
No Repair or replace suspected part, Go to Step 12.
9
INSPECT INTERNAL RESISTANCE OF
HO2S HEATER
z
Measure the resistance between the
suspect HO2S terminal A and C, on the
component side.
z
Is the resistance between 3-30 ohms?
Yes Go to the next step.
No
Replace HO2S.
(See
FRONT HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION
[MZI-3.7]
.)
(See
REAR HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION
[MZI-3.7]
.)
Go to Step 12.
10
INSPECT HO2S CASE FOR SHORT TO
POWER SUPPLY, HTR, AND SIGNRTN
z
Measure the resistance between the
suspect HO2S terminal A and D at
component side.
z
Measure the resistance between the
suspect HO2S terminal A and body
ground.
z
Is the resistance more than 10 kilohms?
Yes Go to the next step.
No
Replace HO2S.
(See
FRONT HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION
[MZI-3.7]
.)
(See
REAR HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION
[MZI-3.7]
.)
Go to the next step.
11
INSPECT FOR CORRECT PCM
OPERATION
z
Disconnect all the PCM connectors.
z
Visually inspect for:
{
Pushed out pins
{
Corrosion
z
Connect all the PCM connectors and
verify that they seat correctly.
z
Retrieve DTCs using the M-MDS.
z
Is the PENDING CODE for this DTC
present?
Yes Go to the next step.
No
The system is correctly. Go to the next step.
VERIFY TROUBLESHOOTING OF
MISFIRE DTC HAS BEEN
COMPLETED
z
Verify that all disconnected connectors
Yes
Replace PCM, then go to the next step. (See
PCM REMOVAL/INSTALLATION [MZI-
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:35 AM
Page 100
© 2005 Mitchell Repair Information Company, LLC.
