Honda Code Retrieval
Accessing Diagnostic Trouble Codes
PGM-CARB
When PGM-CARB warning lamp is illuminated, turn ignition On, pull
passenger side carpet inspection flap downward under dashboard and observe
LED on top of control unit. The LED indicates a system failure by its
blinking frequency.
The control unit LED can indicate any number of simultaneous component
problems by blinking separate codes, one after another.
If diagnostic trouble codes 7, 9, 11, 12, 13 or higher than 14 are
indicated, count the number of blinks again; if indicator is in fact
blinking these DTC's, substitute a known good control unit and recheck. If
indication goes away, replace control unit. The PGM-CARB dash warning lamp
and control unit LED may come on, indicating a system problem, when, in
fact, there is a poor or intermittent electrical connection. First, clean or
repair connections as required.
PGM-FI
Except 1990-95 Accord, 1990-91 Prelude 2.1L, 1992-95 Prelude &
1991-95 Civic
In the event of a PGM-FI system electrical malfunction, a dash mounted
indicator lamp will light and stay illuminated. If the dash warning lamp
is on, or if a system malfunction is suspected even though the lamp is
off, it is necessary to check the electronic control unit LED display. The
LED display is on the ECM (ECU), which is located just below the right
hand side of the instrument panel. The indicator lamps operate whenever
the ignition is on and a diagnostic trouble code is stored in the ECM
(ECU) memory.
When an abnormality is detected the LED display on the ECM (ECU)
blinks. The LED blinks a certain number of times, with the number of
blinks indicating the number of the diagnostic trouble code. After the LED
blinks a number of times there will be a two second pause and the LED will
blink out the number of the next DTC.
1990-95 Accord Four-Cylinder, 1990-91 Prelude 2.1L, 1992-95 Prelude
& 1991-95 Civic
If the malfunction indicator/check engine lamp remains illuminated or
comes on while the engine is operating, the ECM has detected a malfunction
and has stored a diagnostic trouble code in its memory. To access the
diagnostic trouble code memory, a jumper wire must be connected between
the check connector terminals, then the ignition switch must be placed in
the On position. The check connector is located under the right hand side
of the instrument panel on Accord and Civic models. On 1990-91 Prelude
models equipped with 2.1 L engine, the check connector is located in the
engine compartment. On 1992-95 Prelude models, the check connector is
located in the passenger compartment behind the center console. The ECM
indicates stored diagnostic trouble code by flashing the malfunction
indicator/check engine lamp. DTC's one through nine are indicated by
individual short blinks and DTC's 10 and above are indicated by long and
short blinks. One long blink is equivalent to 10 short blinks. The
diagnostic trouble code can be determined by adding the long and short
blinks.
1995 Accord V6
If the malfunction indicator/check engine lamp remains illuminated or
comes on while the engine is operating, the ECM has detected a malfunction
and has stored a diagnostic trouble code in its memory. To access the
diagnostic trouble code memory, connect the Honda PGM Tester or an OBD II
scan tool to the 16-pin Data Link Connector (DLC) in the center console
next to the cigarette lighter. Turn the ignition switch On and begin
troubleshooting as indicated by the tester. Follow the tester's prompts to
diagnose the error. If unsure how to operate the OBD It scan tool or Honda
PGM tester, refer to the tools user's manuals for specific operating
instructions.
1996 Accord, Civic & Odyssey
If the malfunction indicator/check engine lamp remains illuminated or
comes on while the engine is operating, the ECM has detected a malfunction
and has stored a diagnostic trouble code in its memory. To access the
diagnostic trouble code memory, connect the Honda PGM Tester or an OBD II
scan tool to the 16-pin DLC in the center console behind the ashtray on
Accord models, or under the left hand side of the instrument panel on
Civic models. When servicing Odyssey models, the connector is located
behind the right hand side of the front console. Turn the ignition switch
On and begin troubleshooting as indicated by the tester. Follow the
tester's prompts to diagnose the error. If unsure how to operate the OBD
II scan tool or Honda PGM tester, refer to the tools user's manuals for
specific operating instructions.
Clearing Diagnostic Trouble Codes
PGM-CARB
After making necessary repairs, disconnect battery negative ground cable
for approximately 10 seconds to reset ECM (ECU) memory. After connecting
battery ground cable, ensure LED display is turned off.
PGM-FI Multi-Point Fuel Injection
Except 1990-95 Accord, 1990-91 Prelude 2.1 L, 1992-95 Prelude &
1991-95 Civic
After making necessary repairs, disconnect battery negative ground
cable for approximately 10 seconds to reset ECM (ECU) memory. After
connecting battery ground cable, ensure LED display is turned off.
1990-95 Accord Four-Cylinder, 1990-91 Prelude 2.1 L, 1992-95 Prelude
& 1991-95 Civic
On Accord and Civic models, remove the back-up fuse from the underhood
fuse/ relay box for approximately 10 seconds to reset the ECM memory. On
Prelude models, remove the clock fuse from the underhood fuse/relay box
for approximately 10 seconds.
1995 Accord V6
After making necessary repairs, the DTC's should be cleared from the
ECM (ECU) memory. This can be done by either turning off the ignition
switch and removing the back-up (7.5A) fuse from the underhood fuse/relay
box for 10 seconds or by using the OBD It scan tool or Honda PGM tester to
clear the ECM's memory. It will also be necessary to remove the SCS
Service Connector if it had been connected, and reset the PCM. Turn the
ignition to OFF, then disconnect the scan tool.
1996 Accord, Civic & Odyssey
After making necessary repairs, the DTC's should be cleared from the
ECM (ECU) memory. This can be done by either turning off the ignition
switch and removing the back-up radio (7.5A) fuse from the underhood
fuse/relay box for 10 seconds, or by using the OBD II scan tool or Honda
PGM tester to clear the ECM's memory. It will also be necessary to remove
the SCS Service Connector if it had been connected, and reset the PCM.
Turn the ignition to OFF, then disconnect the scan tool.
Throttle Body Fuel Injection
After making necessary repairs, the DTC's should be cleared from the ECM
(ECU) memory. Removing the hazard fuse at the main fuse box for
approximately 10 seconds will clear all stored codes.
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