DTC P2096:00 [MZR 2.0, MZR 2.5]

id0102g3707500

DTC P2096:00

Target A/F feedback system too lean
DETECTION CONDITION
•  The PCM monitors the target A/F fuel trim when under the target A/F feedback control. If the fuel trim is more than the specification, the PCM determines that the target A/F feedback system is too lean.
Diagnostic support note
•  This is a continuous monitor (fuel system).
•  The MIL illuminates if the PCM detects the above malfunctioning condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
•  PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
•  FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
•  The DTC is stored in the PCM memory.
POSSIBLE CAUSE
•  Leakage exhaust gas (between TWC and HO2S)
•  HO2S malfunction
•  IAT sensor malfunction
•  Erratic signal to PCM
―  ECT sensor signal malfunction
―  MAF sensor signal malfunction
―  TP sensor signal malfunction
―  VSS signal malfunction
•  Leakage exhaust gas (between intake manifold and A/F sensor)
•  A/F sensor malfunction
•  Air suction in intake air system
•  MAF sensor malfunction
•  Fuel supply system malfunction or improper fuel line pressure
―  Fuel leakage in fuel line from fuel distributor to fuel pump
―  Pressure regulator malfunction (built-in fuel pump unit)
―  Fuel pump unit malfunction
•  Ignition system malfunction
―  Ignition coil related wiring harness malfunction
―  Spark plug malfunction
―  Ignition coil malfunction
•  Fuel injector operation malfunction
―  Fuel injector related wiring harness malfunction
―  Fuel injector malfunction
•  Insufficient engine compression
•  ECT sensor malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2)
•  Perform the Freeze Frame PID Data Access Procedure.
•  Is the DTC P2096:00 on FREEZE FRAME DATA (Mode 2)?
Yes
Go to the next step.
No
Go to the troubleshooting procedures for DTC on FREEZE FRAME DATA (Mode 2).
(See DTC TABLE [MZR 2.0, MZR 2.5].)
2
VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
•  Have the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (fuel system related) been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.
3
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
4
VERIFY RELATED PENDING CODE AND STORED DTC
•  Switch the ignition to off, then to ON (engine off).
•  Perform the DTC Reading Procedure and Pending Trouble Code Access Procedure.
•  Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 2.0, MZR 2.5].)
No
Go to the next step.
5
INSPECT HO2S
•  Inspect the HO2S.
•  Is there any malfunction?
Yes
Go to the next step.
No
Go to Step 7.
6
INSPECT EXHAUST GAS LEAKAGE
•  Visually inspect for the exhaust gas leakage between the TWC and HO2S.
•  Is there any leakage?
Yes
Repair or replace the malfunctioning parts according to the inspection results, then go to Step 20.
No
Replace the HO2S, then go to Step 20.
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].)
7
INSPECT IAT SENSOR
•  Switch the ignition to off.
•  Inspect the IAT sensor.
•  Is there any malfunction?
Yes
Replace the MAF/IAT sensor, then go to Step 20.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].)
No
Go to the next step.
8
VERIFY CURRENT INPUT SIGNAL STATUS
•  Connect the M-MDS to the DLC-2.
•  Access the following PIDs using the M-MDS.
―  ECT
―  MAF
―  TP REL
―  VSS
•  Are the PIDs normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts according to the inspection results, then go to Step 20.
9
VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA (MODE 2) CONDITION
•  Connect the M-MDS to the DLC-2.
•  Access the following PIDs using the M-MDS under the FREEZE FRAME DATA (Mode 2) condition.
―  ECT
―  MAF
―  TP REL
―  VSS
•  Are the PIDs normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts according to the inspection results, then go to Step 20.
10
INSPECT A/F SENSOR
•  Inspect the A/F sensor.
•  Is there any malfunction?
Yes
Go to the next step.
No
Go to Step 12.
11
INSPECT EXHAUST GAS LEAKAGE
•  Visually inspect for the exhaust gas leakage between the intake manifold and A/F sensor.
•  Is there any leakage?
Yes
Repair or replace the malfunctioning parts according to the inspection results, then go to Step 20.
No
Replace the A/F sensor, then go to Step 20.
(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].)
12
VERIFY CURRENT INPUT SIGNAL STATUS OF MAF SENSOR
•  Connect the M-MDS to the DLC-2.
•  Start the engine.
•  Access the MAF PID using the M-MDS.
•  Verify that the MAF PID changes quickly according to engine speed.
•  Is the MAF PID value normal?
Yes
Go to Step 14.
No
Go to the next step.
13
INSPECT INTAKE AIR SYSTEM FOR EXCESSIVE AIR SUCTION
•  Switch the ignition to off.
•  Visually inspect the hose in intake air system for looseness, cracks or damages.
Note
•  Engine speed may change when rust penetrating agent is splayed on the air suction area.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning parts according to the inspection results, then go to Step 20.
No
Replace the MAF/IAT sensor, then go to Step 20.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].)
14
INSPECT FUEL LINE PRESSURE
•  Switch the ignition to off.
Note
•  If engine will not start, inspect fuel line pressure with ignition is switched to ON.
•  Inspect fuel line pressure while engine running.
•  Is there any malfunction?
Yes
Go to the next step.
No
Go to Step 16.
15
INSPECT FUEL SYSTEM FOR FUEL LEAKAGE
•  Visually inspect the fuel leakage in the fuel system.
Note
•  Engine speed may change when rust penetrating agent is sprayed on the air suction area.
•  Is there any leakage?
Yes
Repair or replace the malfunctioning parts according to the inspection results, then go to Step 20.
No
Replace the fuel pump unit, then go to Step 20.
(See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].)
16
INSPECT IGNITION SYSTEM OPERATION
•  Carry out the spark test.
•  Is strong blue spark visible at each cylinder?
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts according to the inspection results, then go to Step 20.
17
INSPECT FUEL INJECTOR OPERATION
•  Perform the Fuel Injector Operation Inspection.
•  Do fuel injectors operate properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts according to the inspection results, then go to Step 20.
18
INSPECT ENGINE COMPRESSION
•  Inspect the engine compression.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning parts according to the inspection results, then go to Step 20.
No
Go to the next step.
19
INSPECT ECT SENSOR
•  Inspect the ECT sensor.
•  Is there any malfunction?
Yes
Replace the ECT sensor, then go to the next step.
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].)
No
Go to the next step.
20
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  After warning up the engine, maintain the idle status for 1 min or more.
•  Perform the Pending Trouble Code Access Procedure.
•  Is the PENDING CODE for this DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
21
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 2.0, MZR 2.5].)
No
DTC troubleshooting completed.