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05−117 DIAGNOSTICS − SFI SYSTEM (1GR−FE) 05B5H−02 DTC P0325/55 KNOCK SENSOR 1 CIRCUIT (BANK 1 OR SINGLE SENSOR) DTC P0327/55 KNOCK SENSOR 1 CIRCUIT LOW INPUT (BANK 1 OR SINGLE SENSOR) DTC P0328/55 KNOCK SENSOR 1 CIRCUIT HIGH INPUT (BANK 1 OR SINGLE SENSOR) DTC P0330/52 KNOCK SENSOR 2 CIRCUIT (BANK 2) DTC P0332/52 KNOCK SENSOR 2 CIRCUIT LOW INPUT (BANK 2) DTC P0333/52 KNOCK SENSOR 2 CIRCUIT HIGH INPUT (BANK 2) CIRCUIT DESCRIPTION A flat type knock sensor (non−resonant type) has the structure that can detect the vibration in a wider band of frequency from about 6 kHz to 15 kHz and has the following features. Knock sensors are fitted on the right bank and left bank of the cylinder block to detect the engine knocking. Each sensor contains a piezoelectric element which generates a voltage when it becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, the ignition timing is retarded to suppress it. DTC No. DTC Detection Condition Trouble Area P0325/55 Output voltage of the knock sensor 1 decreases beyond a threshold. (Threshold varies according to an engine speed.) S Knock sensor 1 S Knock sensor 1 (loose) S ECM P0330/52 Output voltage of the knock sensor 2 decreases beyond a threshold. (Threshold varies according to an engine speed.) S Knock sensor 2 S Knock sensor 2 (loose) S ECM P0327/55 P0332/52 Output voltage the knock sensor 1 and 2 are 0.5 V or less. S Short in knock sensor 1 and 2 circuit S Knock sensor 1 and 2 S ECM P0328/55 P0333/52 Output voltage the knock sensor 1 and 2 are 4.5 V or more. S Open in knock sensor 1 and 2 circuit S Knock sensor 1 and 2 S ECM Reference: The correct waveform is as shown. KNK Signal Waveform GND A05134 LAND CRUISER PRADO Supplement (RM1017E) Item Contents Terminal KNK1 − EKNK or KNK2 − EKN2 Equipment Set 0.01 to 10 V/ DIV, 0.01 to 10 msec./ DIV Condition After warming up the engine, keep the engine speed 4,000 rpm. 05−118 DIAGNOSTICS − SFI SYSTEM (1GR−FE) WIRING DIAGRAM K3 Knock Sensor 1 (Bank1) 2 1 ECM B W (*1) K4 Knock Sensor 2 (*1) (Bank2) 1 (*1) 2 (*1) 2 EE1 B 5 EE1 W 1 EE1 BR G (*1) R BR (*1) 1 KNK1 E12 (*1) 28 EKNK E12 (*1) (*1) 4 EE1 G 6 EE1 R 5V 2 KNK2 E12 (*1) 5V 20 EKN2 E12 BR EU *1: Shielded A73821 INSPECTION PROCEDURE HINT: DTC P0325/55, P0327/55 and P0328/55 is for the bank1 knock sensor circuit. DTC P0330/52, P0332/52 and P0333/52 is for the bank2 knock sensor circuit. Read freeze frame data using the hand−held tester, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air−fuel ratio was lean or rich, etc. at the time of the malfunction. S S S 1 READ OUTPUT DTC(CHECK KNOCK SENSOR CIRCUIT) EE1 ECM (a) (b) Knock Sensor 1 1 2 2 2 2 1 KNK1 E12 5 5 28 EKNK E12 4 4 2 KNK2 E12 6 20 EKN2 E12 6 Male Connector EE1 Female Connector A73822 LAND CRUISER PRADO Supplement (RM1017E) Disconnect the EE1 connector. Using lead wires, connect the EE1 connectors as follows. Male connector − Female connector Terminal 2 − Terminal 4 Terminal 5 − Terminal 6 Terminal 4 − Terminal 2 Terminal 6 − Terminal 5 (c) (d) (e) Warm up the engine. Race the engine to 3,000 rpm for 10 seconds or more. Check the DTC. 05−119 DIAGNOSTICS − SFI SYSTEM (1GR−FE) Result : Display Proceed to DTC same as when vehicle brought in P0325/55, P0327/55, P0328/55 ® P0325/55, P0327/55, P0328/55 or P0330/52, P0332/52, P0333/52 ® P0330/52, P0332/52, P0333/52 A DTC different from when vehicle brought in P0325/55 ® P0330/52 or P0330/52 ® P0325/55 B DTC different from when vehicle brought in P0327/55, P0328/55 ® P0332/52, P0333/52 or P0332/52, P0333/52 ® P0327/55, P0328/55 C B Go to step 4 C Go to step 5 A 2 CHECK HARNESS AND CONNECTOR(EE1 CONNECTOR − ECM) (a) (b) (c) Wire Harness Side EE1 Disconnect the EE1 connector. Disconnect the E12 ECM connector. Check for continuity between the wire harness side connectors. Standard (Check for open): Symbols (Terminal No.) Specified condition EE1 female connector 2 − KNK1 (E12−1) EE1 female connector 5 − EKNK (E12−28) Female Connector Continuity EE1 female connector 4 − KNK2 (E12−2) A75544 EE1 female connector 6 − EKN2 (E12−20) Standard (Check for short): Symbols (Terminal No.) Specified condition EE1 female connector 2 or KNK1 (E12−1) − Body ground E12 EE1 female connector 5 or EKNK (E12−28) − Body ground EE1 female connector 4 or KNK2 (E12−2) − Body ground No Continuity EE1 female connector 6 or EKN2 (E12−20) − Body ground KNK2 ECM Connector KNK1 EKN2 EKNK A55005 OK LAND CRUISER PRADO Supplement (RM1017E) NG REPAIR OR CONNECTOR REPLACE HARNESS OR 05−120 DIAGNOSTICS 3 − SFI SYSTEM (1GR−FE) INSPECT ECM KNK2 (a) (b) (c) KNK1 EKN2 Disconnect the E12 ECM connector. Turn the ignition switch ON. Check the voltage between the ECM side terminals. Voltage: EKNK Symbols (Terminal No.) KNK1 (E12−1) − EKNK (E12−28) KNK2 (E12−2) − EKN2 (E12−20) Specified condition 4 5 to 5.5 4.5 55V E12 ECM Connector A76969 NG REPLACE ECM OK CHECK AND REPLACE ECM (See page 01−35) 4 CHECK KNOCK SENSOR (a) A76270 Check the knock sensor installation. Torque: 20 N×m (204 kgf×cm, 15 ft×lbf) NG TIGHTEN SENSOR OK REPLACE KNOCK SENSOR (See page 10−9) 5 INSPECT KNOCK SENSOR (a) (b) Wire Harness Side EE1 Disconnect the EE1 connector. Check the resistance between the terminals of the EE1 male connector. Resistance: Terminal No. EE1 male connector 2 − 5 EE1 male connector 4 − 6 Specified condition 120 to 280 kW Male Connector A72922 NG LAND CRUISER PRADO Supplement (RM1017E) OK CHECK FOR INTERMITTENT PROBLEMS (See page 05−7) 05−121 DIAGNOSTICS 6 − SFI SYSTEM (1GR−FE) CHECK HARNESS AND CONNECTOR(EE1 CONNECTOR − KNOCK SENSOR) HINT: S S (a) (b) (c) Wire Harness Side EE1 If DTC P0327/55, P0328/55 has changed to P0332/52, P0333/52 check the knock sensor circuit on the bank1 side. If DTC P0332/52, P0333/52 has changed to P0327/55, P0328/55 check the knock sensor circuit on the bank2 side. Disconnect the EE1 connector. Disconnect the K3 and K4 knock sensor connectors. Check for continuity between the wire harness side connectors. Standard (Check for open): Terminal No. Specified condition EE1 male connector 2 − K3−2 EE1 male connector 5 − K3−1 Male Connector EE1 male connector 4 − K4−2 A72922 Continuity EE1 male connector 6 − K4−1 Standard (Check for short): Terminal No. Knock Sensor Connector Specified condition EE1 male connector 2 or K3−2 − Body ground EE1 male connector 5 or K3−1 − Body ground 1 2 EE1 male connector 4 or K4−2 − Body ground No continuity EE1 male connector 6 or K4−1 − Body ground K3 K4 A61031 NG OK REPLACE KNOCK SENSOR (See page 10−9) LAND CRUISER PRADO Supplement (RM1017E) REPAIR OR CONNECTOR REPLACE HARNESS OR