DTC P0148:00 [MZI-3.7]

id0102d2312000

DTC P0148:00 | Fuel delivery error
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DETECTION CONDITION | • At least 1 bank is lean at wide open throttle (WOT).
POSSIBLE CAUSE | • Damaged or worn fuel pump • Damaged or contaminated MAF sensor • Severely restricted fuel filter • Severely restricted fuel supply line • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record FREEZE FRAME DATA on the repair order, then go to the next step.
2 | 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.
3 | INSPECT SYSTEM INTEGRITY • Visually inspect the complete fuel delivery system for damage and leakage. • Check the following: ― Fuel lines and connections ― Relays ― Fuel tank ― Fuel pump ― Fuel pressure regulator ― Fuel pulse damper ― Fuel rail at fuel injectors ― Damaged connector pins ― Electrical connectors not fully engaged • Verify that the vehicle has followed the maintenance schedule (For Mexico specs.). • Verify that the fuse integrity. • Verify that the battery is fully charged. • Verify that there is clean sufficient fuel. • Is a concern present? | Yes | Repair if necessary. Then go to Step 11.
No | Go to the next step.
4 | INSPECT FUEL PRESSURE • Turn the ignition switch off. • Relieve the fuel pressure. Refer to the Workshop Manual Fuel System Pressure Release procedure. • Connect the mechanical fuel pressure gauge. • Turn the ignition switch to the ON position (engine off). • Pressurize the fuel system. Refer to the “FUEL LINE PRESSURE INSPECTION”. • Compare the fuel pressure reading to the Fuel line pressure Specification. Fuel line pressure 375—450 kPa {3.83—4.58 kgf/cm2, 54.4—65.2 psi} • Is the fuel pressure within range? | Yes | Go to Step 8.
No | Go to the next step.
5 | INSPECT FUEL PUMP GROUND CIRCUIT FOR OPEN CIRCUIT IN WIRING HARNESS Note • Refer to the Wiring Diagrams Manual for schematic and connector information. • Disconnect the fuel pump connector. • Measure the voltage between fuel pump connector terminal D (wiring harness-side) and battery positive terminal. • Is the voltage more than 10 V? | Yes | Go to the next step.
No | Repair or replace suspected part, Then go to Step 11.
6 | INSPECT FUEL PUMP POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT IN WIRING HARNESS • Access the fuel pump connector. • Turn the ignition switch to the ON position (engine running). • Measure the voltage between fuel pump connector terminal B (wiring harness-side) and body ground. • Is the voltage more than 10 V? | Yes | Go to the next step.
No | Repair or replace suspected part, Then go to Step 11.
7 | INSPECT FUEL PRESSURE LEAK • Connect the mechanical fuel pressure gauge. • Turn the ignition switch to the ON position (engine running). • Allow the fuel pressure to stabilize. • Record the stabilized reading. • Turn the ignition switch off. • Monitor the fuel pressure for 1 min. • Does the fuel pressure remain within 34 kPa {255 mmHg, 10.0 inHg} of the recorded reading after 1 min? | Yes | Perform the KOEO self-test. (See KOEO/KOER SELF TEST [MZI-3.7].) Go to Step 9.
No | Go to the next step.
8 | INSPECT FUEL INJECTOR OPERATION • Perform the Fuel Injector Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7].) • Do the fuel injectors operate properly? | Yes | Go to the next step.
No | Repair or replace the malfunctioning part according to the inspection results, then go to Step 11.
9 | INSPECT FUEL SUPPLY LINE FOR RESTRICTION Note • Observe the Warnings, Cautions, and Notes, referring to “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION”. • Disconnect the fuel supply line at the fuel rail. • Disconnect the fuel supply line at the fuel pump. • Check the fuel supply line for restriction. • Apply 21—34 kPa {2142—3467 mmHg, 84.34—136.4 inHg} air pressure to the fuel supply line. • Does air flow freely through the line? | Yes | Go to the next step.
No | Repair the cause of the restriction. Then go to Step 12.
10 | VERIFY THE REPAIR Warning • Strict observance of posted speed limits and attention to driving conditions are mandatory when carrying out the road test. Failure to follow these instructions may result in personal injury. • Turn the ignition switch to the ON position, Key ON, engine running. Engine at normal operating temperature Monitor the mechanical gauge From a stop, accelerate to 89 km/h (55 mph) at full throttle. Repeat this 3 times. Is the fuel pressure always greater than 240 kPa {2.45 kgf/cm2, 34.8 psi}? | Yes | The test is complete and no concerns are present.
No | Replace the fuel pump module. Then go to the next step.
11 | VERIFY TROUBLESHOOTING OF DTC P0148:00 HAS BEEN COMPLETED • Verify that all disconnected connectors are reconnected. • Clear the DTC from the PCM memory using the M-MDS. • Start the engine and run it at idle. • Retrieve DTCs using the M-MDS. • Is the PENDING CODE for this DTC present? | Yes | Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZI-3.7].) Go to the next step.
No | Go to the next step.
12 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZI-3.7].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].)
No | Troubleshooting completed.