Relay Control Module Test

WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

The relay control module is part of the under-hood fuse/ relay box, and it contains these relays:

PGM-FI main relay 1
Ignition coil relay
PGM-FI subrelay
ETCS relay

If any of these relays fail the test, replace the under-hood fuse/relay box.

Do the battery terminal disconnection procedure,(see BATTERY TERMINAL DISCONNECTION AND RECONNECTION then disconnect under-hood fuse/relay box connectors C (2P), E (14P), and H (9P).

Fig 1: Identifying Under-Hood Fuse/Relay Box Connectors Terminals C (2P), E (14P),And H (9P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Connect battery power to the C2 terminal.
PGM-FI main relay 1:
- Connect the E5 terminal to body ground. There should be battery voltage between the H1 terminal and body ground.
- Disconnect the E5 terminal from the body ground. There should be no voltage between the HI terminal and the body ground.
Ignition coil relay:
- Connect the E5 terminal to body ground. There should be battery voltage between the H6 terminal and body ground.
- Disconnect the E5 terminal from the body ground. There should be no voltage between the H6 terminal and the body ground.
PGM-FI subrelay:
- Connect the E5 and E13 terminals to body ground. There should be battery voltage between the H9 terminal and body ground.
- Disconnect the E5 terminal from the body ground. There should be no voltage between the H9 terminal and the body ground.
ETCS relay:
- Connect the E5 and E14 terminals to body ground. There should be battery voltage between the H7 terminal and body ground.
- Disconnect the E5 terminal from the body ground. There should be no voltage between the H7 terminal and the body ground.