5
INSPECT POWER SUPPLY IN WIRING
HARNESS
z
Disconnect suspect HO2S connector.
z
Turn the ignition switch to the ON
position (Engine off).
z
Measure the voltage between suspect
HO2S connector terminal A and C, on
the wiring harness side.
z
Is the voltage more than 10 V?
Yes Turn the ignition switch off. Go to the next
step.
No Repair or replace suspected part, Go to Step 12.
6
INSPECT HO2S HEATER FOR SHORT
TO GROUND
z
Disconnect the PCM connector.
z
Measure the resistance between HO2S
terminal A on the wiring harness side
and body ground.
z
Is the resistance more than 10 kilohms?
Yes Go to the next step.
No Repair or replace suspected part, Go to Step 12.
7
INSPECT HO2S HEATER FOR SHORT
IN WIRING HARNESS
z
Measure the resistance between the
following terminals:
{
HO2S terminal A (wiring
harness-side) and HO2S terminal
C (wiring harness-side)
{
HO2S terminal A (wiring
harness-side) and HO2S terminal
D (wiring harness-side)
{
HO2S terminal A (wiring
harness-side) and HO2S terminal
B (wiring harness-side)
z
Are the resistances more than 10
kilohms?
Yes Go to the next step.
No Repair or replace suspected part, Go to Step 12.
8
INSPECT HO2S HEATER CIRCUIT
FOR OPEN CIRCUIT IN WIRING
HARNESS
z
For DTC P0135, measure the resistance
between PCM terminal 2J and front
HO2S (RH) terminal A.
z
For DTC P0141, measure the resistance
between PCM terminal 2AS and rear
HO2S (RH) terminal A.
Yes Go to the next step.
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 99
© 2005 Mitchell Repair Information Company, LLC.
