Conditions For Setting The Dtcs - Suzuki XL7 2007 Service Manual

1A-89 Engine General Information and Diagnosis:

Conditions for Setting the DTCs

The ECM determines that the length of time for a primary
HO2S to switch from lean to rich and back to lean, which
is called a switching cycle, has exceeded a
predetermined threshold. The condition exists for 3
cycles out of a 20 cycle test sample.
Action Taken when the DTCs Set
DTCs P0133 and P0153 are Type B DTCs.
Conditions for Clearing the MIL/DTCs
DTCs P0133 and P0153 are Type B DTCs.
Reference Information
Schematic Reference
"Engine Controls Schematics"
Connector End View Reference
• "Engine Control Module Connector End Views"
• "Engine Controls Connector End Views"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
DTC Type Reference
"Powertrain Diagnostic Trouble Code (DTC) Type
Definitions"
Scan Tool Reference
• "Scan Tool Data List - Engine Controls - 3.6L (LY7)"
• "Scan Tool Data Definitions - Engine Controls - 3.6L
(LY7)"
• "Scan Tool Output Controls - Engine Controls - 3.6L
(LY7)"
Circuit/System Verification
1. Verify that other DTCs are not set.
➢ If any other DTCs are set, refer to "Diagnostic
Trouble Code (DTC) List - Vehicle Diagnostic
Information: ".
2. Engine idling, observe the HO2S voltage parameter.
The voltage should fluctuate above and below the
range of 350-550 mV.
3. Operate the vehicle within the conditions for running
the DTC. DTCs P0133 and P0153 should not set.
4. If the vehicle passes the Circuit/System Verification
test, then operate the vehicle within the conditions
for running the DTC. You may also operate the
vehicle within the conditions that are captured in the
Freeze Frame/Failure Records Data List.
Circuit/System Testing
1. Verify that none of the following conditions exist:
– Lean or rich fuel injectors—Refer to "Fuel Injector
Balance Test with Special Tool: " or "Fuel Injector
Balance Test with Tech 2: ".
– Water intrusion in the HO2S harness connector
– HO2S wiring harness damage
– Incorrect RTV sealant
– Low or high fuel system pressure—Refer to "Fuel
System Diagnosis: ".
– Fuel that is contaminated—Refer to "Alcohol/
Contaminants-in-Fuel Diagnosis (w/o Special
Tool): " "Alcohol/Contaminants-in-Fuel Diagnosis
(w/ Special Tool): ".
– Fuel saturation of the evaporative emission
(EVAP) canister
– Exhaust leaks near the HO2S
– Engine vacuum leaks
– Engine oil consumption
– Engine coolant consumption
➢ If you find any of the above conditions, repair as
necessary.
2. If all conditions test normal, replace the appropriate
HO2S.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Heated Oxygen Sensor Replacement - Bank 1
Sensor 1: "
• "Heated Oxygen Sensor Replacement - Bank 2
Sensor 1: "
• "Control Module References: " for engine control
module replacement, setup, and programming