{
Exhaust leaks at flanges and
gaskets
z
Are any air leaks present?
5
INSPECT HO2S CIRCUIT (S) FOR
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?
Yes Go to the next step.
No
Repair or replace suspected part, Then go to
Step 17.
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)
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 91
© 2005 Mitchell Repair Information Company, LLC.
