IMA System IMA System Indicator Circuit Troubleshooting

Turn the ignition switch ON (II), and watch the IMA system indicator.
Does the IMA indicator come on and stay on?
1. YES - Go to step 17.
2. NO - Go to step 2.
Turn the ignition switch OFF.
Check the No. 6 METER (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
1. YES - Go to step 3.
2. NO - Check for a short or open in the wire between the No. 6 METER (7.5 A) fuse in the under-dash fuse/relay box and the gauge assembly.
Turn the battery module switch OFF (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
Remove the IPU lid (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
Connect MCM connector terminal A18 to body ground with a jumper wire.

Fig 1: Connecting MCM Connector Terminal A18 To Body Ground Using Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch ON (II).
Is the IMA system indicator ON?
1. YES - Go to step 9.
2. NO - Go to step 8.
Check the IMA system indicator bulb.
Is IMA system indicator bulb OK?
1. YES - Repair open in the wire between the MCM (A18) and the gauge assembly.
2. NO - Replace the IMA system indicator bulb.
Check the No. 24 IMA (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
1. YES - Go to step 10.
2. NO - Check for a short or open in the wire between the No. 24 IMA (7.5 A) fuse in the under-dash fuse/ relay box and the MCM.
Measure voltage between body ground and MCM connector terminals A11 and B1 individually.

Fig 2: Measuring Voltage Between Body Ground And MCM Connector Terminals A11 And B1
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 16.
2. NO - Go to step 11.
Turn the ignition switch OFF.
Check the MCM relay (ignition hold relay) (see POWER RELAY TEST ).
Is the relay OK?
1. YES - Go to step 13.
2. NO - Replace the MCM relay (ignition hold relay).
Turn the ignition switch ON (II).
Measure voltage between MCM relay (ignition hold relay) 4P connector terminal No. 4 and body ground.

Fig 3: Measuring Voltage Between MCM Relay 4P Connector Terminal No. 4 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 15.
2. NO - Check for:
  - Repair open in the wire between the No. 24 IMA (7.5 A) fuse in the under-dash fuse/relay box and the diode.
  - Repair open in the wire between the MCM relay (ignition hold relay) and the diode.
  - A faulty diode.
Measure voltage between MCM relay (ignition hold relay) 4P connector terminal No. 2 and body ground.

Fig 4: Measuring Voltage Between MCM Relay 4P Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Repair open in the wire between the MCM (A11, B1) and the MCM relay (ignition hold relay).
2. NO - Check for:
  - A blow No. 18 IMA (7.5) fuse in the under-dash fuse/relay box.
  - An open in the wire between the No. 18 IMA (7.5 A) fuse in the under-dash fuse/relay box and the MCM relay (ignition hold relay).
Measure voltage between body ground and MCM connector terminals A10, A23, A24, and B9 individually

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

Is there less 1.0 V?
1. YES - Substitute a known-good MCM, then recheck. If the symptom/indication goes away replace the original MCM.
2. NO - Repair open in the wire(s) that had than 1.0 V between G101, G502 and the MCM (A10, A23, A24, B9).
Check for DTCs
Are any DTCs indicated?
1. YES - Troubleshoot the DTC indicate.
2. NO - Go to step 18.
Turn the ignition switch OFF.
Turn the battery module switch OFF (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
Remove the IPU lid (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
Disconnect MCM connector A.
Turn the ignition switch ON (II).
Does the IMA system indicator stay on?
1. YES - Repair short to ground in the wire between the MCM (A18) and the gauge assembly.
2. NO - Substitute a known-good MCM, and recheck. If the symptom/goes away, replace the original MCM.