2010 Cadillac CTS Sedan AWD V6-3.6L Page 1919
Conditions for Running the DTC
P2177 or P2179
* Before the ECM can report DTC P2177 or P2179, failed, DTCs P000A, P000B, P000C, P000D, P0008, P0009, P0010, P0011, P0013,
P0014, P0016, P0017, P0018, P0019, P0020, P0021, P0023, P0024, P0101, P0121, P0122, P0123, P0133, P0153, P0201, P0202, P0203,
P0204, P0205, P0206, P0221, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0300, P0301, P0302,
P0303, P0304, P0305, P0306, P0335, P0336, P0338, P0443, P0458, P0459, P0461, P0462, P0463, P2068 P2088, P2089, P2090, P2091,
P2092, P2093, P2094, P2095 P2146, P2149, P2152, P2155, P216A, and P216D must run and pass.
* The engine speed is between 1,200-3,400 RPM.
* The engine load is between 13-40 %.
* The throttle angle is less than 100 %.
* The cold start fuel control is not active.
* The Closed Loop fuel control is enabled.
* The engine is not in decel fuel cut-off.
* The intake air temperature (IAT) is colder than 60掳C (140掳F).
* The calculated amount of fuel metered into the engine is greater than 700 g.
* DTC P2177 and P2179 run continuously once the above conditions are met for approximately 300 s, after Closed Loop fuel control is
enabled.
P2187 or P2189
* Before the ECM can report DTC P2187 or P2189, failed, DTCs P000A, P000B, P000C, P000D, P0008, P0009, P0010, P0011, P0013,
P0014, P0016, P0017, P0018, P0019, P0020, P0021, P0023, P0024, P0101, P0121, P0122, P0123, P0133, P0153, P0201, P0202, P0203,
P0204, P0205, P0206, P0221, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0300, P0301, P0302,
P0303, P0304, P0305, P0306, P0335, P0336, P0338, P0443, P0458, P0459, P0461, P0462, P0463, P2068 P2088, P2089, P2090, P2091,
P2092, P2093, P2094, P2095 P2146, P2149, P2152, P2155, P216A, and P216D must run and pass.
* The engine speed is between 519-1,001 RPM.
* The engine load is between 0-24 %.
* The throttle angle is less than 100 %.
* The cold start fuel control is not active.
* The Closed Loop fuel control is enabled.
* The engine is not in decel fuel cut-off.
* The engine coolant temperature (ECT) is warmer than 60掳C (140掳F).
* The intake air temperature (IAT) is colder than 61掳C (142掳F).
* The calculated amount of fuel metered into the engine is greater than 700 g.
* DTC P2187 and P2189 run continuously once the above conditions are met for approximately 300 s, after Closed Loop fuel control is
enabled.
Conditions for Setting the DTC
P2177 or P2179
The Long Term Fuel Trim Cruise/Accel is greater than 32 % for 4 s or for a cumulative time of 30 s.
P2187 or P2189
The Long Term Fuel Trim Idle/Decel is greater than 6 % for 4 s or for a cumulative of 30 s.
Action Taken When the DTC Sets
DTCs P2177, P2179, P2187 and P2189 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P2177, P2179, P2187 and P2189 are Type B DTCs.
Diagnostic Aids
* An HO2S will not cause this DTC to set without the occurrence of circuit related HO2S DTCs. Do not replace an HO2S to address this DTC.
* Observing the LT FT Bn 1 and Bn 2 parameters, while driving the vehicle can determine whether the lean condition is effecting only one
bank , or is common to both banks of the engine.
* A fuel system delivery condition causes this DTC to set. Thoroughly inspect all items that cause a lean condition. Refer to Fuel System
Diagnosis (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/Fuel System Diagnosis).
* Any un-metered air into the engine causes this DTC to set. Thoroughly inspect all areas of the engine for vacuum leaks.
* A MAF sensor condition can cause this DTC without setting a MAF DTC. If there is a MAF sensor condition, the MAF sensor parameters
will appear to be within range.
* Inspect the air filter for being the correct one for this application. Make sure that the engine oil fill cap is in place and that it is tight. Verify
that the engine oil dip stick is fully seated.
