Diagnostic system check-engine controls (RZ4E-TC)

  • If there are no complaints on drivability, do not perform these diagnostic steps unless otherwise instructed in other sections.
  • Check for related Service Bulletins before starting the diagnosis.
  • Do not clear the DTC unless instructed to do so in a diagnostic step.
  • If a malfunction is found in the engine starting system, check the symptom diagnosis relating to the engine starting.
  • The battery should be fully charged.
  • The battery cable should be normal and securely connected.
  • The ground of the ECM should be securely connected to the correct position.
  • The ECM harness connectors should be clean and correctly connected.
  • Do not attempt to crank the engine with the ECM harness connectors disconnected.
  • The ECM terminals should be clean and correctly connected.
  • Check if the Injector ID Code is programmed correctly.
  • Check whether the immobilizer information is programmed correctly.
  • If fuel system DTC P0087, P0088, P0089, P0093, P1093 or other DTCs are set, diagnose sensor DTCs, solenoid DTCs, actuator DTCs, and relay DTCs first.

1. Scan tool power-up check

1) Connect the scan tool. Does the scan tool power up?

Yes

=>Go to Scan tool communication verification.

No

Go to Scan tool does not power up.

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) Scan tool does not power up".

2. Scan tool communication verification

1) Turn ON the ignition switch.

2) Check the communication status with the ECM using the scan tool. Can communication with the ECM be established?

Yes

=>Go to Control module DTC check.

No

Go to Lost communication with the ECM.

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) lost communication with the ECM (models with radar sensor/ stereo camera)".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) lost communication with the ECM (models without radar sensor and stereo camera)".

3. Control module DTC check

1) Observe the DTC information for each control module with a scan tool. Does the scan tool display a DTC for any control module?

Yes

=>Go to Communication-related DTC check.

No

=>Go to Customer's concern check.

4. Communication-related DTC check

1) Observe the DTC information with a scan tool. Is a DTC beginning with U or a DTC related to communication with other control modules set?

Yes

Go to the applicable DTC diagnosis.

No

=>Go to Control module internal-related DTC check.

5. Control module internal-related DTC check

1) Observe the DTC information with a scan tool. Is DTC P0601, P0602, P0604, P0606, P060B, or P1621 set?

Yes

Go to the applicable DTC diagnosis.

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0601 (Flash Code 53) Internal Control Module Memory Check Sum Error".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0602 (Flash Code 154) Control Module Programming Error".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0604 (Flash Code 153) Internal Control Module Random Access Memory (RAM) Error".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0606 (Flash Code 51) ECM/PCM Processor".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P060B (Flash Code 36) Internal Control Module A/D Processing Performance".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P1621 (Flash Code 54) Control Module Long Term Memory Performance".

No

=>Go to System voltage-related DTC check.

6. System voltage-related DTC check

1) Observe the DTC information with a scan tool. Is DTC P0563 set?

Yes

Go to DTC P0563 diagnosis.

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0563 (Flash Code 35) System Voltage High".

No

=>Go to Other DTC check.

7. Other DTC check

1) Observe the DTC information with a scan tool. Are other DTCs set?

Yes

Go to the applicable DTC diagnosis.

No

=>Go to Cranking check.

8. Cranking check

1) Crank the engine. Does the engine crank?

Note

  • If the immobilizer system is activated, the ECM deactivates the fuel injection and performs starter cut to cancel cranking.

Yes

=>Go to Engine start check.

No

=>Go to Immobilizer-related DTC check.

9. Engine start check

1) Start the engine. Does the engine start?

Yes

=>Go to Customer's concern check.

No

Go to Starting system check.

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) starting system check".

10. Immobilizer-related DTC check

1) Observe the DTC information with a scan tool. Is DTC P0633, P161B, U0167, U2300, U2301, U2302, or U2303 set?

Yes

Go to the applicable DTC diagnosis.

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0633 (Flash Code 176) Immobilizer Key Not Programmed - ECM/PCM".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P161B (Flash Code 179) Immobilizer Wrong Response".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC U0167 (Flash Code 177) Lost Communication with Vehicle Immobilizer Control Module".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC U2300 (Flash Code 181) Immobilizer Ignition Line Off".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC U2301 (Flash Code 181) Immobilizer Transponder Authentication NG".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC U2302 (Flash Code 181) Immobilizer Anti-Scanning Mode".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC U2303 (Flash Code 182) Immobilizer Unknown Signal Received".

No

Diagnose the cause of the lack of cranking.

Refer to "202.Engine 15D.Symptom(RZ4E-TC) engine does not turn over".

11. Customer's concern check

1) Check if the customer's concern is related to the systems other than engines. Is the customer's concern related to the systems other than engines?

Yes

Go to the applicable control system inspection.

No

=>Go to Symptom check.

12. Symptom check

1) Check if the following symptoms are present. Is there any applicable symptom?

  • Hard start
  • Rough, unstable
  • High idle speed
  • Cuts out
  • Surges
  • Lack of power, sluggishness or sponginess
  • Hesitation, sag or stumble
  • Abnormal combustion noise
  • Poor fuel economy
  • Black smoke
  • White smoke

Yes

Repair the applicable symptom.

Refer to "202.Engine 15D.Symptom(RZ4E-TC) Hard start".

Refer to "202.Engine 15D.Symptom(RZ4E-TC) rough, unstable".

Refer to "202.Engine 15D.Symptom(RZ4E-TC) High idle speed".

Refer to "202.Engine 15D.Symptom(RZ4E-TC) cuts out".

Refer to "202.Engine 15D.Symptom(RZ4E-TC) surges".

Refer to "202.Engine 15D.Symptom(RZ4E-TC) lack of power, sluggishness or sponginess".

Refer to "202.Engine 15D.Symptom(RZ4E-TC) hesitation, sag or stumble".

Refer to "202.Engine 15D.Symptom(RZ4E-TC) abnormal combustion noise".

Refer to "202.Engine 15D.Symptom(RZ4E-TC) poor fuel economy".

Refer to "202.Engine 15D.Symptom(RZ4E-TC) Black smoke".

Refer to "202.Engine 15D.Symptom(RZ4E-TC) White smoke".

No

Go to Intermittent conditions of engine.

Refer to "202.Engine 15D.Symptom(RZ4E-TC) intermittent conditions of engine".

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