NO.10 LOW IDLE/STALLS DURING DECELERATION [MZR 2.3 DISI Turbo]

id0103e2801600

10

LOW IDLE/STALLS DURING DECELERATION
DESCRIPTION
•  Engine stops unexpectedly at beginning of deceleration or recovery from deceleration.
POSSIBLE CAUSE
•  Poor fuel quality
•  Vacuum leakage
•  Improper operation of electronic throttle control system
•  Air leakage from intake-air system
•  Intake-air system restriction
•  EVAP control system malfunction
•  Improper air/fuel mixture ratio control
•  Erratic signal from CKP sensor
•  Erratic signal from CMP sensor
•  APP sensor or related circuit malfunction
•  TP sensor or related circuit malfunction
•  MAF sensor (integrated in MAF/IAT sensor) or related circuit malfunction
•  A/F sensor, HO2S or related circuit malfunction
•  Brake switch or related circuit malfunction
•  CPP switch or related circuit malfunction
•  Neutral switch or related circuit malfunction
•  Improper operation of A/C magnetic clutch
•  Inadequate fuel pressure (high or low pressure side)
•  Spill valve control solenoid valve malfunction (built-in high pressure fuel pump)
•  Relief valve malfunction (built-in fuel delivery pipe)
•  Fuel leakage
•  Fuel line restriction
•  Fuel filter clogging
•  Incorrect fuel injection timing
•  High pressure fuel pump malfunction
•  Fuel injector malfunction
•  Low engine compression
•  Improper valve timing
•  EGR system malfunction
•  Vacuum leakage
•  ECT sensor or related circuit malfunction
•  Fuel pressure sensor (built-in fuel delivery pipe) malfunction
Warning
•  The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:
―  Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
―  Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION [MZR 2.3 DISI Turbo].) (See AFTER SERVICE PRECAUTION [MZR 2.3 DISI Turbo].)
Caution
•  Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION
1
Does the engine idle rough?
Yes
Perform the symptom troubleshooting “NO.8 ENGINE RUNS ROUGH/ROLLING IDLE”.
(See NO.8 ENGINE RUNS ROUGH/ROLLING IDLE [MZR 2.3 DISI Turbo].)
No
Go to the next step.
2
Inspect for the following:
•  Fuel quality (proper octane, contamination, winter/summer blend)
•  Intake-air system restriction or leakage
•  Fuel leakage in fuel system
•  Vacuum leakage
Is there any malfunction?
Yes
Service if necessary.
•  Repeat this step.
No
Go to the next step.
3
Inspect the CMP sensor and CKP sensor for the following:
•  Installation condition
•  Damaged trigger wheel and camshaft
•  Open or short circuit in the wiring harnesses
Is there any malfunction?
Yes
Repair or replace the malfunctioning parts according to the inspection results.
No
Go to the next step.
4
Switch the ignition to ON.
Retrieve any DTCs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)
Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 2.3 DISI Turbo].)
No
Go to the next step.
5
Access the following PIDs using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)
•  AC_REQ
•  APP1
•  APP2
•  BOO
•  ECT
•  MAF
•  TP REL
•  O2S11
•  O2S12
•  LONGFT1
•  SHTFT1
Do the PID values indicate the correct values under the trouble condition?
(See PCM INSPECTION [MZR 2.3 DISI Turbo].)
Yes
Go to the next step.
No
Inspect the suspected parts and related wiring harness.
•  If normal:
―  Perform the “INTERMITTENT CONCERN TROUBLESHOOTING.
•  If not:
―  Repair or replace the malfunctioning parts according to the inspection results.
6
Perform the EGR Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)
Does the EGR system operate properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts according to the inspection results.
7
Perform the TP sweep inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)
Does the electronic throttle control system work properly?
Yes
Visually inspect the throttle body (damage/scratching).
•  If normal:
―  Go to the next step.
•  If not:
―  Repair or replace the malfunctioning parts according to the inspection results.
No
Repair or replace the malfunctioning parts according to the inspection results.
8
Perform the Purge Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)
Does the purge solenoid valve work properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts according to the inspection results.
9
Perform the A/C Cut-off Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)
Does the A/C cut-off operation work properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts according to the inspection results.
10
Access the FUEL_PRES PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)
Is the FUEL_PRES PID value within the specification?
(See PCM INSPECTION [MZR 2.3 DISI Turbo].)
Yes
Go to Step 14.
No
Go to the next step.
11
Is the vehicle accelerate performance normally?
Yes
Go to the next step.
No
Go to Step 13.
12
Inspect the fuel pressure sensor.
(See FUEL PRESSURE SENSOR INSPECTION [MZR 2.3 DISI Turbo].)
Is there any malfunction?
Yes
Replace the fuel delivery pipe.
(See FUEL INJECTOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
No
Go to Step 14.
13
Replace the high pressure fuel pump.
(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
Access the FUEL_PRES PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)
Is the FUEL_PRES PID value within the specified?
(See PCM INSPECTION [MZR 2.3 DISI Turbo].)
Yes
High-pressure fuel pump or spill valve control solenoid valve (built-in high pressure fuel pump) malfunction.
No
Relief valve malfunction.
•  Replace the fuel delivery pipe.
14
Connect the fuel pressure gauge between the fuel pump and the high pressure fuel pump.
Measure the fuel pressure line of the low pressure side.
(See FUEL LINE PRESSURE INSPECTION [MZR 2.3 DISI Turbo].)
Is the fuel pressure within the specification?
Yes
Go to the next step.
No
Inspect for the following:
•  Fuel line restriction
•  Fuel filter clogging
•  If normal:
―  Replace the fuel pump unit.
•  If not:
―  Repair or replace the malfunctioning parts according to the inspection results.
15
Perform the Fuel Injector Operation Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)
Do the fuel injectors operate normally?
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts according to the inspection results.
16
Measure the compression pressure for each cylinder.
(See COMPRESSION INSPECTION [MZR 2.3 DISI Turbo].)
Are compression pressures within the specification?
Yes
Replace the PCM (injector driver circuit malfunction).
(See PCM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
•  If a malfunction remains:
―  Repair or replace the malfunctioning part according to the inspection results.
No
Inspect for the following:
•  Damaged valve seat
•  Worn valve stem and valve guide
•  Worn or stuck piston ring
•  Worn piston, piston ring or cylinder
•  Improper valve timing
Repair or replace the malfunctioning parts according to the inspection results.
17
Verify test results.
•  If normal, return to the diagnostic index to service any additional symptoms.
•  If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
―  If the vehicle is repaired, troubleshooting is completed.
―  If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.