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                                                                                                                             DI-21
                                                   DIAGNOSTICS   -   ENGINE
                                                                                                                              DI21R-03


PROBLEM SYMPTOMS TABLE
                                  Symptom                                            Suspect Area                        See page
                                                             13.Starter                                                   ST-19
Engine does not crank (Does not start)
                                                             14.Starter relay                                             ST-21

                                                             1. ECM power source circuit                                 DI-144
No initial combustion (Does not start)                       2. Fuel pump control circuit                                DI-147
                                                             3. Engine control module (ECM)                              IN-31
No complete combustion (Does not start)                      1. Fuel pump control circuit                                DI-147
                                                             1. Starter signal circuit                                   DI-141
Engine cranks normally (Difficult to start)                  2. Fuel pump control circuit                                DI-147
                                                             3. Compression                                              EM-3
                                                             1. Starter signal circuit                                   DI-141
Cold engine (Difficult to start)
                                                             2. Fuel pump control circuit                                DI-147

                                                             1. Starter signal circuit                                   DI-141
Hot engine (Difficult to start)
                                                             2. Fuel pump control circuit                                DI-147

                                                             1. A/C signal circuit (Compressor Circuit)     Manual A/C   AC-133
High engine idle speed (Poor idling)                                                                          Auto A/C   DI-776
                                                             2. ECM power source circuit                                 DI-144
                                                             1. A/C signal circuit (Compressor Circuit)     Manual A/C   AC-133
Low engine idle speed (Poor idling)                                                                           Auto A/C   DI-776
                                                             2. Fuel pump control circuit                                DI-147
                                                             1. Compression                                              EM-3
Rough idling (Poor idling)
                                                             2. Fuel pump control circuit                                DI-147

                                                             1. ECM power source circuit                                 DI-144
Hunting (Poor idling)
                                                             2. Fuel pump control circuit                                DI-147

                                                             1. Fuel pump control circuit                                DI-147
Hesitation/Poor acceleration (Poor driveability)
                                                             2. A/T faulty                                               DI-171

Surging (Poor driveability)                                  1. Fuel pump control circuit                                DI-147
Soon after starting (Engine stall)                           1. Fuel pump control circuit                                DI-147
                                                             1. A/C signal circuit (Compressor Circuit)     Manual A/C   AC-133
During A/C operation (Engine stall)                                                                           Auto A/C   DI-776
                                                             2. Engine control module (ECM)                               IN-31




2001 SIENNA (RM787U)

                                                                                Author :                  Date :              175

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