OPEN CIRCUIT IN WIRING
HARNESS
z
Turn the ignition switch off.
z
Remove the jumper wire (s).
z
Visually inspect the HO2S wiring
harness for exposed wiring, water
contamination, corrosion, and
proper assembly.
z
Disconnect the PCM connector.
z
Measure the resistance between
the following terminals:
{
PCM terminal 2Y (wiring
harness-side) and front
HO2S (RH) terminal B
(wiring harness-side)
{
PCM terminal 2BG (wiring
harness-side) and rear
HO2S (RH) terminal B
(wiring harness-side)
{
PCM terminal 2U (wiring
harness-side) and front
HO2S (LH) terminal B
(wiring harness-side)
{
PCM terminal 2BC (wiring
harness-side) and rear
HO2S (LH) terminal B
(wiring harness-side)
{
PCM terminal 2AL (wiring
harness-side) and HO2S
terminal D (wiring harness-
side)
z
Are the resistances less than 5
ohms?
No
Repair or replace suspected part, Then go
to Step 17.
6
INSPECT HO2S CIRCUIT FOR
SHORT TO POWER SUPPLY
z
Measure the resistance between
the following terminals:
{
PCM terminal 1BJ (wiring
harness-side) and PCM
terminal 2Y (wiring
harness-side)
{
PCM terminal 1BJ (wiring
Yes
Go to the next step.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:30 AM
Page 93
© 2005 Mitchell Repair Information Company, LLC.