Land Rover Common Rail System Crs Denso Manual
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Repair Section2–106 (4) Connector connection fault verification method • Simultaneously perform the data monitor and connector voltage measurements. Q002334E 1. Read the Coolant Temperature Output Voltage value using the DST-2 data monitor. 2. Measure the voltage directly from the corresponding ECU terminal. Ex.) Coolant temperature sensor If 1 is unsatisfactory and 2 is satisfactory, the connector connection is judged as faulty. Since some malfunctions only occur intermittently, measure voltage while pulling and shaking the wires in order to try to get the malfunction to reoccur. Voltage Measurement No.2 - 34P No.5 - 31P 35 41 137 143 62 69 162 167
Repair Section2–107 5. TROUBLESHOOTING 5.1 Troubleshooting According to Malfunction Symptom (for TOYOTA Ve- hicles) (1) Malfunction Indicator Lamp (MIL) is lit. Clogged air cleaner element (2) The engine is hard to start. Clogged air cleaner element Description The check engine warning light is lit when the engine is running, or before the engine is started. Possible Cause The DTC is recorded in the engine ECU. 1 Connect the DST-2 and read the DTC. Inspect the check engine warning light circuit. Troubleshoot the corresponding DTC. Description The starter turns at normal speed, but the engine takes too long to start. Possible Cause • Start signal circuit • Glow control system • Crankshaft position sensor • Engine ECU power supply circuit • Injector • Supply pump • Cylinder recognition sensor 1 Use the DST-2 to verify whether the coolant temperature is at the glow system operating temperature. In addition, verify whether battery voltage is being supplied to the glow plugs at the designated times.Repair the glow control system. (Refer to the glow control system check procedure issued by the vehicle manufacturer.) 2 Use the DST-2 to monitor engine speed while cranking the engine. Verify whether engine speed is being correctly output. Check the crankshaft position sensor. (Refer to the crankshaft position sensor check procedure issued by the vehicle manufacturer.) NG OK NG OK NG
Repair Section2–108 3 Verify the output waveform of the cylinder rec- ognition sensor. (Refer to the cylinder recogni- tion sensor check procedure issued by the vehicle manufacturer.)Repair or replace the cylinder recognition sen- sor and/or the corresponding circuit. 4 Check each injector. (Refer to the injector check procedure issued by the vehicle manufacturer.)Repair or replace the injector and/or the corre- sponding circuit. 5 Verify whether there is a start signal when cranking the engine by checking the engine ECU start signal terminal.Repair the start signal circuit. 6 Check the engine ECU power supply. (Refer to the engine ECU power supply circuit diagram issued by the vehicle manufacturer.)Repair the engine ECU power supply. 7 Check the supply pump and the supply pump drive circuit. (Refer to the supply pump drive cir- cuit diagram issued by the vehicle manufac- turer.)Repair or replace the supply pump and drive cir- cuit. Troubleshooting complete OK NG OK NG OK NG OK NG OK NG OK
Repair Section2–109 (3) The engine stalls when idling. Clogged air cleaner element Description The engine stalls after starting or when idling. Possible Cause • Crankshaft position sensor • Engine ECU power supply circuit • Injector • Supply pump • Engine cooling system • Start signal circuit 1 Verify that the engine is not overheated. Repair the engine cooling system. 2 Check the crankshaft position sensor output waveform. (Refer to the crankshaft position sen- sor check procedure issued by the vehicle man- ufacturer.)Repair or replace the crankshaft position sensor and/or the corresponding circuit. 3 Check each injector. (Refer to the injector check procedure issued by the vehicle manufacturer.)Repair or replace the injector and/or the corre- sponding circuit. 4 Verify whether there is a start signal when cranking the engine by checking the engine ECU start signal terminal.Repair the start signal circuit. 5 Check the engine ECU power supply. (Refer to the engine ECU power supply circuit diagram issued by the vehicle manufacturer.)Repair the engine ECU power supply. 6 Check the supply pump and the supply pump drive circuit. (Refer to the supply pump drive cir- cuit diagram issued by the vehicle manufac- turer.)Repair or replace the supply pump and drive cir- cuit. Troubleshooting complete NG OK NG OK NG OK NG OK NG OK NG OK
Repair Section2–11 0 (4) The engine cranks normally, but does not start. Clogged air cleaner element Description The engine is cranked at the normal speed, but does not start. Possible Cause • Crankshaft position sensor • Engine ECU power supply circuit • Injector • Supply pump • Start signal circuit 1 Use the DST-2 to verify whether the coolant temperature is at the glow system operating temperature. In addition, verify whether battery voltage is being supplied to the glow plugs at the designated times.Repair the glow control system. (Refer to the glow control system check procedure issued by the vehicle manufacturer.) 2 Monitor engine speed while cranking the engine. Verify whether engine speed is being correctly output.Check the crankshaft position sensor. (Refer to the crankshaft position sensor check procedure issued by the vehicle manufacturer.) 3 Verify whether there is a start signal when cranking the engine by checking the engine ECU start signal terminal.Repair the start signal circuit. 4 Check the engine ECU power supply. (Refer to the engine ECU power supply circuit diagram issued by the vehicle manufacturer.)Repair the engine ECU power supply. 5 Check each injector. (Refer to the injector check procedure issued by the vehicle manufacturer.)Repair or replace the injector and/or the corre- sponding circuit. 6 Check the supply pump and the supply pump drive circuit. (Refer to the supply pump drive cir- cuit diagram issued by the vehicle manufac- turer.)Repair or replace the supply pump and drive cir- cuit. Troubleshooting complete NG OK NG OK NG OK NG OK NG OK NG OK
Repair Section2–111 (5) Idle instability following engine start Clogged air cleaner element Description Idle speed after starting the engine is abnormal. Possible Cause • Injector • Supply pump • Fuel filter • Engine ECU • Rail pressure sensor 1 Check each injector. (Refer to the injector check procedure issued by the vehicle manufacturer.)Repair or replace the injector and/or the corre- sponding circuit. 2 Check the fuel filter. Replace the fuel filter. 3 Check the supply pump and the supply pump drive circuit. (Refer to the supply pump drive cir- cuit diagram issued by the vehicle manufac- turer.)Repair or replace the supply pump and drive cir- cuit. 4 Check the rail pressure sensor and the corre- sponding circuit. (Refer to the rail pressure sen- sor check procedure issued by the vehicle manufacturer.)Repair or replace the rail pressure sensor and the corresponding circuit. Troubleshooting complete NG OK NG OK NG OK NG OK
Repair Section2–11 2 (6) The engine returns to idle speed too slowly, or does not return at all. Clogged air cleaner element Description The time required for the engine to return to idle speed is longer than normal, or the engine does not return to idle speed. Possible Cause • Accelerator position sensor • Injector • Supply pump 1 Perform the accelerator pedal position sensor function check. (Refer to the accelerator posi- tion pedal sensor check procedure issued by the vehicle manufacturer.)Repair or replace the accelerator position sen- sor and/or the corresponding circuit. 2 Check each injector. (Refer to the injector check procedure issued by the vehicle manufacturer.)Repair or replace the injector and/or the corre- sponding circuit. 3 Check the supply pump and the supply pump drive circuit. (Refer to the supply pump drive cir- cuit diagram issued by the vehicle manufac- turer.)Repair or replace the supply pump and drive cir- cuit. Troubleshooting complete NG OK NG OK NG OK
Repair Section2–11 3 (7) Rough idle Clogged air cleaner element Description Idle speed fluctuates, causing the engine to vibrate. Possible Cause • Engine cooling system • Crankshaft position sensor • Engine • Supply pump • Injector 1 Check parts that may be a source of abnormal engine vibration.Repair the engine. 2 Check each injector. (Refer to the injector check procedure issued by the vehicle manufacturer.)Repair or replace the injector and/or the corre- sponding circuit. 3 Verify that the engine is not overheated. Repair the engine cooling system. 4 Check the crankshaft position sensor. (Refer to the crankshaft position sensor check procedure issued by the vehicle manufacturer.)Repair or replace the crankshaft position sensor and/or the corresponding circuit. 5 Check the supply pump and the supply pump drive circuit. (Refer to the supply pump drive cir- cuit diagram issued by the vehicle manufac- turer.)Repair or replace the supply pump and drive cir- cuit. Troubleshooting complete NG OK NG OK NG OK NG OK NG OK
Repair Section2–11 4 (8) The engine stalls when decelerating. Clogged air cleaner element Description The engine suddenly stops when decelerating. Possible Cause • Engine cooling system • Crankshaft position sensor • Engine ECU power supply circuit • Supply pump • Injector • Start signal circuit 1 Verify that the engine is not overheated. Repair the engine cooling system. 2 Check the crankshaft position sensor. (Refer to the crankshaft position sensor check procedure issued by the vehicle manufacturer.)Repair or replace the crankshaft position sensor and/or the corresponding circuit. 3 Check each injector. (Refer to the injector check procedure issued by the vehicle manufacturer.)Repair or replace the injector and/or the corre- sponding circuit. 4 Verify whether there is a start signal when cranking the engine by checking the engine ECU start signal terminal.Repair the start signal circuit. 5 Check the engine ECU power supply. (Refer to the engine ECU power supply circuit diagram issued by the vehicle manufacturer.)Repair the engine ECU power supply. 6 Check the supply pump and the supply pump drive circuit. (Refer to the supply pump drive cir- cuit diagram issued by the vehicle manufac- turer.)Repair or replace the supply pump and drive cir- cuit. Troubleshooting complete NG OK NG OK NG OK NG OK NG OK NG OK
Repair Section2–11 5 (9) Poor engine output, poor acceleration Clogged air cleaner element Description Deficient engine performance. Possible Cause • EGR system • Injector • Mass Air Flow (MAF) meter • Crankshaft position sensor • Accelerator position sensor • Boost pressure sensor • Supply pump • Start signal circuit • Air cleaner, duct 1 Check for air cleaner clogging and/or damage. Replace the air cleaner or repair the air duct. 2 Verify that the engine is not overheated. Repair the engine cooling system. 3 Check the crankshaft position sensor. (Refer to the crankshaft position sensor check procedure issued by the vehicle manufacturer.)Repair or replace the crankshaft position sensor and/or the corresponding circuit. 4 Check each injector. (Refer to the injector check procedure issued by the vehicle manufacturer.)Repair or replace the injector and/or the corre- sponding circuit. 5 Verify whether there is a start signal when cranking the engine by checking the engine ECU start signal terminal.Repair the start signal circuit. 6 Check the MAF meter and the corresponding circuit. (Refer to the MAF meter check proce- dure issued by the vehicle manufacturer.)Repair or replace the MAF meter and/or the cor- responding circuit. NG OK NG OK NG OK NG OK NG OK NG OK