Engine Control System (Introduction): Diagnosis Infiniti QX80 I

On Board Diagnostic (OBD) System of Engine and A/T

The ECM has an on board diagnostic system. It will illuminate the malfunction indicator lamp (MIL) to warn the driver of a malfunction causing emission deterioration.

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1. Always use a 12 volt battery as power source.
2. Never attempt to disconnect battery cables while engine is running.
3. Before connecting or disconnecting the ECM harness connector, turn ignition switch OFF and disconnect negative battery cable. Failure to do so may damage the ECM because battery voltage is applied to ECM even if ignition switch is turned OFF.
4. Before removing parts, turn ignition switch OFF and then disconnect battery ground cable.
5. Never disassemble ECM.
6. If a battery cable is disconnected, the memory will return to the ECM value. The ECM will now start to self-control at its initial value. Thus, engine operation can vary slightly in this case. However, this is not an indication of a malfunction. Never replace parts because of a slight variation.
7. If the battery is disconnected, the following emission-related diagnostic information will be lost within 24 hours. Diagnostic trouble codes 1st trip diagnostic trouble codes Freeze frame data 1st trip freeze frame data System readiness test (SRT) codes Test values
8. When connecting ECM harness connector (A), fasten (B) it securely with a lever as far as it will go as shown in the figure below. ECM (1) Loosen (C)
9. When connecting or disconnecting pin connectors into or from ECM, never damage pin terminals (bends or break). Check that there are not any bends or breaks on ECM pin terminal, when connecting pin connectors.
10. Securely connect ECM harness connectors. A poor connection can cause an extremely high (surge) voltage to develop in coil and condenser, thus resulting in damage to ICs.
11. Keep engine control system harness at least 10 cm (4 in) away from adjacent harness, to prevent engine control system malfunctions due to receiving external noise, degraded operation of ICs, etc.
12. Keep engine control system parts and harness dry.
13. Before replacing ECM, perform ECM Terminals and Reference Value inspection and check that ECM functions properly. Refer to " «REFERENCE VALUE»(ref-618040-S40470023782014052700000) ".
14. Handle mass air flow sensor carefully to avoid damage.
15. Never clean mass air flow sensor with any type of detergent.
16. Never disassemble electric throttle control actuator.
17. Even a slight leakage in the air intake system can cause serious incidents.
18. Never shock or jar the camshaft position sensor, crankshaft position sensor.
19. After performing each TROUBLE DIAGNOSIS, perform DTC Confirmation Procedure or Component Function Check. The DTC should not be displayed in the DTC Confirmation Procedure if the repair is completed. The Component Function Check should be a good result if the repair is completed.
20. When measuring ECM signals with a circuit tester, never allow the two tester probes to contact. Accidental contact of probes will cause a short circuit and damage the ECM power transistor.
21. B1 indicates bank 1, B2 indicates bank 2 as shown in the figure below.
22. Never operate fuel pump when there is no fuel in lines.
23. Tighten fuel hose clamps to the specified torque.
24. Never depress accelerator pedal when starting.
25. Immediately after starting, never rev up engine unnecessarily.
26. Never rev up engine just prior to shutdown.
27. When installing C.B. ham radio or a mobile phone, be sure to observe the following as it may adversely affect electronic control systems depending on installation location. Keep the antenna as far as possible from the electronic control units. Keep the antenna feeder line more than 20 cm (8 in) away from the harness of electronic controls. Never let them run parallel for a long distance. Adjust the antenna and feeder line so that the standing-wave ratio can be kept smaller. Be sure to ground the radio to vehicle body.

GST (Generic Scan Tool)

When GST is connected with a data link connector equipped on the vehicle side, it will communicate with the control module equipped in the vehicle and then enable various kinds of diagnostic tests. Refer to " DESCRIPTION ".

Note. Service $0A is not applied for regions where it is not mandated.

DTC AND 1ST TRIP DTC

The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic result obtained. If the ECM memory was cleared previously, and the 1st trip DTC did not recur, the 1st trip DTC will not be displayed.

If a malfunction is detected during the 1st trip, the 1st trip DTC is saved in the ECM memory. The MIL will not light up (two trip detection logic). If the same malfunction is not detected in the 2nd trip (meeting the required driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the 2nd trip, both the 1st trip DTC and DTC are saved in the ECM memory and the MIL lights up. In other words, the DTC is stored in the ECM memory and the MIL lights up when the same malfunction occurs in two consecutive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd trips, only the 1st trip DTC will continue to be stored. For malfunctions that blink or light up the MIL during the 1st trip, the DTC and 1st trip DTC are stored in the ECM memory.

For malfunctions in which 1st trip DTCs are displayed, refer to " DTC INDEX ". These items are required by legal regulations to continuously monitor the system/component. In addition, the items monitored non-continuously are also displayed on CONSULT.

1st trip DTC is specified in Service $07 of SAE J1979/ISO 15031-5. 1st trip DTC detection occurs without illuminating the MIL and therefore does not warn the driver of a malfunction.

When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame data as specified in Work Flow procedure Step 2 , refer to " WORK FLOW ". Then perform DTC Confirmation Procedure or Component Function Check to try to duplicate the malfunction. If the malfunction is duplicated, the item requires repair.

RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS

1. When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are stored in the ECM memory.
2. When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are stored in the ECM memory, and the MIL will come on.
3. The MIL will turn OFF after the vehicle is driven 3 times (driving pattern B) with no malfunction. The drive is counted only when the recorded driving pattern is met (as stored in the ECM). If another malfunction occurs while counting, the counter will reset.
4. The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A) without the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and Fuel Injection System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times (driving pattern C) without the same malfunction recurring. The "TIME" in "SELF-DIAGNOSTIC RESULTS" mode of CONSULT will count the number of times the vehicle is driven.
5. The 1st trip DTC is not displayed when the self-diagnosis results in OK for the 2nd trip.

PERMANENT DTC SET TIMING

The setting timing of permanent DTC is stored in ECM with the lighting of MIL when a DTC is confirmed.

ON BOARD DIAGNOSIS ITEM

The on board diagnostic system has the following functions.

SELF-DIAGNOSTIC RESULTS MODE

Description

This function allows to indicate DTCs or 1st trip DTCs stored in ECM according to the number of times MIL is blinking.

How to Set Self-diagnostic Results Mode

Note. It is better to count the time accurately with a clock. It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has a malfunction. After ignition switch is turned off, ECM is always released from the "Self-diagnostic results" mode.

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1. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
2. Repeat the following procedure quickly five times within 5 seconds. Fully depress the accelerator pedal. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it depressed for approx. 10 seconds until the MIL starts blinking. NOTE: Do not release the accelerator pedal for 10 seconds if MIL starts blinking during this period. This blinking is displaying SRT status and is continued for another 10 seconds.
4. Fully release the accelerator pedal. ECM has entered to Self-diagnostic results mode. NOTE: Wait until the same DTC (or 1st trip DTC) appears to completely confirm all DTCs. How to Read Self-diagnostic Results The DTC and 1st trip DTC are indicated by the number of blinks of the MIL as shown below. The DTC and 1st trip DTC are displayed at the same time. If the MIL does not illuminate in diagnostic test mode I (Malfunction warning), all displayed items are 1st trip DTCs. If only one code is displayed when the MIL illuminates in "malfunction warning" mode, it is a DTC; if two or more codes are displayed, they may be either DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These unidentified codes can be identified by using the CONSULT or GST. A DTC will be used as an example for how to read a code.

A particular trouble code can be identified by the number of four-digit numeral flashes per the following.

The length of time the 1, 000th-digit numeral flashes on and off is 1.2 seconds consisting of an ON (0.6-seconds) - OFF (0.6-seconds) cycle.

The 100th-digit numeral and lower digit numerals consist of a 0.3-seconds ON and 0.3-seconds OFF cycle. A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later numeral appears on the display 1.3 seconds after the former numeral has disappeared. A change from one trouble code to another occurs at an interval of 1.8-seconds OFF.

In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no malfunction. Refer to " DTC INDEX ".

How to Erase Self-diagnostic Results

By performing this procedure, ECM memory is erased and the following diagnostic information is erased as well.

1. Diagnostic trouble codes
2. 1st trip diagnostic trouble codes
3. Freeze frame data
4. 1st trip freeze frame data
5. System readiness test (SRT) codes
6. Test values

Note. Also, if a battery terminal is disconnected, ECM memory is erased and the diagnostic information as listed above is erased. (The amount of time required for erasing may vary from a few seconds to several hours.)

1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Set ECM in "Self-diagnostic" results.
6. The diagnostic information has been erased from the backup memory in the ECM. Fully depress the accelerator pedal and keep it depressed for more than 10 seconds.
7. Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.

SELF DIAGNOSTIC RESULT MODE

Self Diagnostic Item

Regarding items of DTC and 1st trip DTC, refer to " DTC INDEX ".

How to Read DTC and 1st Trip DTC

DTCs and 1st trip DTCs related to the malfunction are displayed in "Self-diag results".

1. When ECM detects a 1st trip DTC, "1t" is displayed for "TIME".
2. When ECM has detected a current DTC, "0" is displayed for "TIME".
3. If "TIME" is neither "0" nor "1t", the DTC occurred in the past and ECM shows the number of times the vehicle has been driven since the last detection of the DTC.

How to Erase DTC and 1st Trip DTC

Note. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10 seconds and then turn it ON (engine stopped) again. If the DTC is not for A/T related items (see " DTC INDEX "), skip step 1 .

1. Erase DTC in TCM. Refer to " «DIAGNOSIS DESCRIPTION»(ref-618051-S39571033862014052700000) ".
2. Select "ENGINE" with CONSULT.
3. Select "SELF-DIAG RESULTS".
4. Touch "ERASE". (DTC in ECM will be erased.) FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA Freeze frame data item (1) Description DIAG TROUBLE CODE [PXXXX] The engine control component part/control system has a trouble code the is displayed as PXXXX. (Refer to " «DTC INDEX»(ref-618040-S16913191172014052700000) ".) CAL/LD VALUE [%] The calculated load value at the moment a malfunction is detected is displayed. COOLANT TEMP [°C] or [°F] The engine coolant temperature at the moment a malfunction is detected is displayed. L-FUEL TRM-B1 [%] "Long-term fuel trim" at the moment a malfunction is detected is displayed. The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule than short-term fuel trim. L-FUEL TRM-B2 [%] S-FUEL TRM-B1 [%] "Short-term fuel trim" at the moment a malfunction is detected is displayed. The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel schedule. S-FUEL TRM-B2 [%] ENGINE SPEED [RPM] The engine speed at the moment a malfunction is detected is displayed. VEHICL SPEED [km/h] or [mph] The vehicle speed at the moment a malfunction is detected is displayed. INT MANI PRES [kPa] These items are displayed but are not applicable to this model. ABSOL TH.P/S [%] The throttle valve opening angle at the moment a malfunction is detected is displayed. B/FUEL SCHDL [msec] The base fuel schedule at the moment a malfunction is detected is displayed. INT/A TEMP SE [°C] or [°F] The intake air temperature at the moment a malfunction is detected is displayed. FUEL SYS-B1 "Fuel injection system status" at the moment a malfunction is detected is displayed. One of the following mode is displayed. Mode2: Open loop due to detected system malfunction Mode3: Open loop due to driving conditions (power enrichment, deceleration enleanment) Mode4: Closed loop - using oxygen sensor(s) as feedback for fuel control Mode5: Open loop - has not yet satisfied condition to go to closed loop FUEL SYS-B2 COMBUST CONDITION These items are displayed but are not applicable to this model. FUEL RAIL PRESSURE [MPa] The fuel rail pressure at the moment a malfunction is detected is displayed. TARGET FUEL RAIL PRESSURE [MPa] The target fuel rail pressure at the moment a malfunction is detected is displayed. BATTERY VOLTAGE [V] The battery voltage at the moment a malfunction is detected is displayed. FUEL LEVEL [%] The fuel level at the moment a malfunction is detected is displayed. (1) The items are the same as those of 1st trip freeze frame data.

ACTIVE TEST MODE

TEST ITEM DESCRIPTION

DTC WORK SUPPORT MODE

SRT & P-DTC MODE

SRT STATUS Mode

1. For items whose SRT codes are set, "CMPLT" is displayed on the CONSULT screen; for items whose SRT codes are not set, "INCMP" is displayed.
2. "SRT STATUS" provides the presence or absence of permanent DTCs stored in ECM memory.

PERMANENT DTC STATUS Mode

How to display permanent DTC status

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1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Select "PERMANENT DTC STATUS" in "DTC & SRT CONFIRMATION" mode with CONSULT. NOTE: Permanent DTCs stored in ECM memory are displayed on the CONSULT screen to show if a driving pattern required for erasing permanent DTCs is complete (CMPLT) or incomplete (INCMP). CAUTION: Since the "PERMANENT DTC STATUS" screen displays the previous trip information, repeat the following twice to update the information: "Ignition switch OFF", "Wait for more than 10 seconds" and "Ignition switch ON". NOTE: This mode is not used in regions that permanent DTCs are not regulated by law. SRT WORK SUPPORT Mode This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status. PERMANENT DTC WORK SUPPORT Mode This mode enables a technician to drive a vehicle to complete the driving pattern that is required for erasing permanent DTC. NOTE: This mode is not used in regions that permanent DTCs are not regulated by law.

VALUES ON THE DIAGNOSIS TOOL

Note. The following table includes information (items) inapplicable to this vehicle. For information (items) applicable to this vehicle, refer to CONSULT display items. Numerical values in the following table are reference values. These values are input/output values that ECM receives/transmits and may differ from actual operations.

Example

The ignition timing shown by the timing light may differ from the ignition timing displayed on the data monitor.

This occurs because the timing light shows a value calculated by ECM according to signals received from the cam shaft position sensor and other sensors related to ignition timing.

For outlines of following items, refer to " CONSULT FUNCTION ".

CONSULT MONITOR ITEM

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NON DTC RELATED ITEM

DTC RELATED ITEM

DTC Inspection Priority Chart

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority chart.

DTC Index

Test Value and Test Limit

The following is the information specified in Service $06 of SAE J1979/ISO 15031-5.

The test value is a parameter used to determine whether a system/circuit diagnostic test is OK or NG while being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the maximum or minimum value and is compared with the test value being monitored.

These data (test value and test limit) are specified by On Board Monitor ID (OBDMID), Test ID (TID), Unit and Scaling ID and can be displayed on the GST screen.

The items of the test value and test limit will be displayed with GST screen which items are provided by the ECM. (e.g., if bank 2 is not applied on this vehicle, only the items of bank 1 are displayed)

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PERMANENT DTC ITEM

For permanent DTC items, MIL turns ON. Refer to " DTC INDEX ".

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1. CHECK DTC Check DTC. Is any DTC detected? YES: Repair malfunction(s) and erase DTC. Refer to " «CONSULT FUNCTION»(ref-618040-S41816322322014052700000) ", " «ON BOARD DIAGNOSIS FUNCTION»(ref-618040-S23529094952014052700000) ". NO: GO TO 2.
2. CHECK PERMANENT DTC With CONSULT Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Select "PERMANENT DTC STATUS" mode with CONSULT. With GST Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Select Service $0A with GST. Is any permanent DTC detected? YES: GO TO 3. NO: END
3. PERFORM DTC CONFIRMATION PROCEDURE Perform "DTC CONFIRMATION PROCEDURE" for DTCs which are the same as permanent DTCs stored in ECM. Refer to " «CONSULT FUNCTION»(ref-618040-S41816322322014052700000) ", " «ON BOARD DIAGNOSIS FUNCTION»(ref-618040-S23529094952014052700000) ". : GO TO 4.
4. CHECK PERMANENT DTC With CONSULT Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Select "PERMANENT DTC STATUS" mode with CONSULT. With GST Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Select Service $0A with GST. Is any permanent DTC detected? YES: GO TO 1 . NO: END

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Note. Drive the vehicle according to only driving patterns indicating "INCMP" in driving patterns B and D on the "PERMANENT DTC STATUS" screen.

1. CHECK DTC Check DTC. Is any DTC detected? YES: Repair malfunction(s) and erase DTC. Refer to " «CONSULT FUNCTION»(ref-618040-S41816322322014052700000) ", " «ON BOARD DIAGNOSIS FUNCTION»(ref-618040-S23529094952014052700000) ". NO: GO TO 2.
2. CHECK PERMANENT DTC With CONSULT Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Select "PERMANENT DTC STATUS" mode with CONSULT. With GST Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Select Service $0A with GST. Is any permanent DTC detected? YES: GO TO 3. NO: END
3. DRIVE DRIVING PATTERN B CAUTION: Always drive at a safe speed. Never erase self-diagnosis results. If self-diagnosis results are erased during the trip of driving pattern B or D, the counter of driving pattern B and D is reset. With CONSULT Start engine and warm it up to normal operating temperature. Use "PERMANENT DTC WORK SUPPORT" mode with CONSULT to drive the vehicle according to driving pattern B. Refer to " «CONSULT FUNCTION»(ref-618040-S41816322322014052700000) ", " «DIAGNOSIS DESCRIPTION: DRIVING PATTERN»(ref-618040-S16480589302014052700000) ". With GST Start engine and warm it up to normal operating temperature. Drive the vehicle according to driving pattern B. Refer to " «DIAGNOSIS DESCRIPTION: DRIVING PATTERN»(ref-618040-S16480589302014052700000) ". : GO TO 4.
4. CHECK PERMANENT DTC With CONSULT Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Select "PERMANENT DTC STATUS" mode with CONSULT. With GST Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Select Service $0A with GST. Is any permanent DTC detected? YES: GO TO 5. NO: END
5. DRIVE DRIVING PATTERN D CAUTION: Always drive at a safe speed. Never erase self-diagnosis results. If self-diagnosis results are erased during the trip of driving pattern B or D, the counter of driving pattern B and D is reset. Drive the vehicle according to driving pattern D. Refer to " «DIAGNOSIS DESCRIPTION: DRIVING PATTERN»(ref-618040-S16480589302014052700000) ". : GO TO 6.
6. CHECK PERMANENT DTC With CONSULT Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Select "PERMANENT DTC STATUS" mode with CONSULT. With GST Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Select Service $0A with GST. Is any permanent DTC detected? YES: GO TO 1 . NO: END

Diagnosis Procedure

1. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT Disconnect ECM harness connector. Check the continuity between ECM harness connector and ground. ECM Ground Continuity Connector Terminal F111 10 Ground Existed E80 174 175 Also check harness for short to power. Is the inspection result normal? YES: GO TO 3 . NO: GO TO 2.
2. DETECT MALFUNCTIONING PART Check the following. Loose or poor connection for each connector and harness Harness for open or short between ECM and ground : Repair open circuit or short to power in harness or connectors.
3. CHECK ECM POWER SUPPLY CIRCUIT-I Reconnect ECM harness connector. Turn ignition switch ON. Check the voltage between ECM harness connector terminals. ECM Voltage Connector + - Terminal Terminal E80 141 175 Battery voltage Is the inspection result normal? YES: GO TO 5 . NO: GO TO 4.
4. DETECT MALFUNCTIONING PART Check the following. 15 A fuse (No. 62) Loose or poor connection for each connector and harness Harness for open or short between ECM and fuse : Repair open circuit, short to ground or short to power in harness or connectors.
5. CHECK ECM POWER SUPPLY CIRCUIT-II Turn ignition switch OFF and wait at least 10 seconds. Check the voltage between ECM harness connector terminals as per the following. ECM Voltage Connector + - Terminal Terminal E80 171 175 After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop to approximately 0 V. 172 Is the inspection result normal? YES: GO TO 6. NO: GO TO 8 .
6. CHECK ECM POWER SUPPLY CIRCUIT-III Turn ignition switch ON. Check the voltage between IPDM E/R harness connector and ground. IPDM E/R Ground Voltage Connector Terminal E15 61 Ground Battery voltage Is the inspection result normal? YES: GO TO 7. NO: Replace IPDM E/R. Refer to " «REMOVAL AND INSTALLATION»(ref-618057-S21229952082014052700000) ".
7. CHECK INTERMITTENT INCIDENT Refer to " «INTERMITTENT INCIDENT»(ref-618029-S15520819712014052700000) ". : INSPECTION END
8. CHECK ECM POWER SUPPLY CIRCUIT-IV Turn ignition switch OFF and wait at least 10 seconds. Check the voltage between ECM harness connector terminals as per the following. ECM Voltage Connector + - Terminal Terminal E80 163 175 Battery voltage Is the inspection result normal? YES: GO TO 12 . NO: GO TO 9.
9. CHECK ECM POWER SUPPLY CIRCUIT-V Disconnect ECM harness connector. Disconnect IPDM E/R harness connector. Check the continuity between ECM harness connector and IPDM E/R harness connector. ECM IPDM E/R Continuity Connector Terminal Connector Terminal E80 163 E14 41 Existed Also check harness for short to ground and short to power. Is the inspection result normal? YES: GO TO 11 . NO: GO TO 10.
10. DETECT MALFUNCTIONING PART Check the following. Loose or poor connection for each connector and harness Harness for open or short between ECM and IPDM E/R : Repair open circuit, short to ground or short to power in harness or connectors.
11. CHECK 20 A FUSE Disconnect 20 A fuse (No. 43) from IPDM E/R. Check 20 A fuse. Is the inspection result normal? YES: GO TO 14 . NO: Replace 15 A fuse.
12. CHECK ECM POWER SUPPLY CIRCUIT-VI Disconnect ECM harness connector. Disconnect IPDM E/R harness connector. Check the continuity between ECM harness connector and IPDM E/R harness connector. ECM IPDM E/R Continuity Connector Terminal Connector Terminal E80 171 E14 35 Existed 172 Also check harness for short to ground and short to power. Is the inspection result normal? YES: GO TO 14 . NO: GO TO 13.
13. DETECT MALFUNCTIONING PART Check the following. Loose or poor connection for each connector and harness Harness for open or short between ECM and IPDM E/R : Repair open circuit, short to ground or short to power in harness or connectors.
14. CHECK INTERMITTENT INCIDENT Refer to " «INTERMITTENT INCIDENT»(ref-618029-S15520819712014052700000) ". Is the inspection result normal? YES: Replace IPDM E/R. Refer to " «REMOVAL AND INSTALLATION»(ref-618057-S21229952082014052700000) ". NO: Repair open circuit, short to ground or short to power in harness or connectors.