2005-2006 models

Turn the ignition switch OFF.
Disconnect the PGM-FI main relay (IGP) 4P connector.
Check for continuity between body ground and PGM-FI main relay (IGP) 4P connector terminal No. 3.

Fig 1: Checking For Continuity Between Body Ground And PGM-FI Main Relay (IGP) 4P Connector Terminal No. 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES -Repair short in the wire between ECM connector terminal A8 and the PGM-FI main relay (IGP).
2. NO -Go to step 4.
Measure voltage between body ground and PGM-FI main relay (IGP) 4P connector terminals No. 2 and No. 4 individually.

Fig 2: Measuring Voltage Between Body Ground And PGM-FI Main Relay (IGP) 4P Connector Terminals No. 2 And No. 4
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES -Go to step 6 .
2. NO -Go to step 5.
Check for a blown No. 7 (15 A) fuse in the under-hood fuse/relay box.
Is the fuse blown?
1. YES -Repair short in the wire between the PGM-FI main relay (IGP) and the No. 7 (15 A) fuse.
2. NO -Repair open in the wire between the PGM-FI main relay (IGP) and the No. 7 (15A)fuse.
Turn the ignition switch ON (II).
Measure voltage between PGM-FI main relay (FUEL PUMP) 4P connector terminal No. 2 and body ground.

Fig 3: Measuring Voltage Between PGM-FI Main Relay (Fuel Pump) 4P Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES -Go to step 9 .
2. NO -Go to step 8.
Check for a blown No. 2 (15 A) fuse in the under-dash fuse/relay box.
Is the fuse blown?
1. YES -Repair short in the wire between the PGM-FI main relay (FUEL PUMP) and the No. 2 (15 A) fuse.
2. NO -Repair open in the wire between the PGM-FI main relay (FUEL PUMP) and the No. 2 (15 A) fuse.
Turn the ignition switch OFF, and wait for 10 seconds.
Disconnect ECM connector A (32P).
Check for continuity between PGM-FI main relay (FUEL PUMP) 4P connector terminal No. 3 and ECM connector terminal A15.

Fig 4: Checking For Continuity Between PGM-FI Main Relay (Fuel Pump) 4P Connector Terminal No. 3 And ECM Connector Terminal A15
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES -Go to step 12.
2. NO -Repair open in the wire between the PGM-FI main relay (FUEL PUMP) and the ECM (A15).
Reconnect ECM connector A (32P) and the PGM-FI main relay (FUEL PUMP) connectors.
Turn the ignition switch ON (II).
Measure voltage between body ground and ECM connector terminals B1 and B9 individually.

Fig 5: Measuring Voltage Between Body Ground And ECM Connector Terminals B1 And B9
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES -Go to step 15.
2. NO -Check for an open in the wires between the PGM-FI main relay (IGP) and the ECM (B1, B9). If the wires are OK, replace the PGM-FI main relay.
Turn the ignition switch OFF.
Turn the ignition switch ON (II), and measure voltage between ECM connector terminals A15 and B2 within 2 seconds.

Fig 6: Measuring Voltage Between ECM Connector Terminals A15 And B2 Within 2 Seconds
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there 1.0 V or less?
1. YES -The PGM-FI main relay may be faulty (see PGM-FI MAIN RELAY TEST ).
2. NO -Update the ECM if it does not have the latest software, or substitute a known-good ECM (see ECM UPDATING AND SUBSTITUTION FOR TESTING-2002-2006 M/T MODELS AND CVT MODEL ), then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM (see ECM REPLACEMENT ).