This readiness code is always set to available because the comprehensive component monitor is continuously
running whenever the engine is cranking or running.
HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS
INTERMITTENT FAILURES
The term intermittent failure means a system may have had a failure, but it checks OK now. If the malfunction
indicator lamp (MIL) on the dash does not come on, check for poor connections or loose terminals at all
connectors related to the circuit that you are troubleshooting. If the MIL was on but then went off, the original
problem may have been intermittent.
SERVICE INFORMATION
Periodically, new PCM software or new service procedures may become available. Always check online for the
latest software or service information related to the DTCs or symptoms you are troubleshooting.
OPENS AND SHORTS
Open and short are common electrical terms. An open is a break in a wire or at a connection. A short is an
accidental connection of a wire to ground or to another wire. In simple electronics, this usually means
something won't work at all. With complex electronics (such as PCMs) this can sometimes mean something
works, but not the way it's supposed to.
HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM)
1. Start the engine, and check the MIL (A).
NOTE:
If the ignition switch is turned to ON (II), and the engine is not started, the
MIL stays on for 15 -20 seconds.
Fig. 1: Identifying MLL
Courtesy of AMERICAN HONDA MOTOR CO., INC.
2. If the MIL stays on, connect the HDS to the data link connector (DLC) (A) located under the driver's side
of the dashboard.
Fig. 2: Identifying Data Link Connector (DLC)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
3. Turn the ignition switch to ON (II).
4. Make sure the HDS communicates with the PCM and other vehicle systems. If it does not, go to the DLC
CIRCUIT TROUBLESHOOTING.
5. Check the diagnostic trouble code (DTC) and note it. Also check the freeze data and/or on-board snapshot
data, and download any data found. Then refer to the indicated DTC's troubleshooting, and begin the
appropriate troubleshooting procedure.
NOTE:
ο¬
ο¬
ο¬
Freeze data indicates the engine conditions when the first
malfunction, misfire, or fuel trim malfunction was detected.
The HDS can read the DTC, the freeze data, the on-board snapshot,
the current data, and other powertrain control module (PCM) data.
For specific operations, refer to the user's manual that came with the
HDS.
6. If no DTCs are found, go to the MIL circuit troubleshooting.
IF THE MIL DID NOT STAY ON
If the MIL did not stay on but there is a driveability problem, do the symptom troubleshooting.
IF YOU CAN'T DUPLICATE THE DTC
Some of the troubleshooting requires you to reset the PCM and try to duplicate the DTC. If the problem is
intermittent and you can't duplicate the DTC, do not continue through the procedure. To do so will only result in
confusion and possibly, a needlessly replaced PCM.
HDS CLEAR COMMAND
The PCM stores various specific data to correct the system even if there is no electrical power such as when the
battery negative terminal or No. A23 (15 A) fuse is disconnected. Stored data based on failed parts should be
cleared by using the CLEAR COMMAND of the HDS, if parts are replaced.
The HDS has three kinds of clear commands to meet this purpose. They are DTC clear, PCM reset, and CKP
pattern clear. The DTC clear command erases all stored DTC codes, freeze data, on-board snapshot, and
readiness codes. This must be done with the HDS after reproducing the DTC during troubleshooting. The PCM
reset command erases all stored DTC codes, freeze data, on-board snapshot, readiness codes, and all specific
data to correct the system except CKP pattern. If the CKP pattern data in the PCM was cleared, you must do the
CKP pattern learn procedure. The CKP pattern clear command erases only CKP pattern data. This command is
for repair of a misfire or the CKP sensor.
SCAN TOOL CLEAR COMMAND
If you are using a generic scan tool to clear commands, be aware that there is only one setting for clearing the
PCM, and it clears all commands at the same time (CKP pattern learn, idle learn, readiness codes, freeze data,
on-board snapshot, and DTCs). After you clear all commands, you then need to do these procedures, in this
order: PCM idle learn procedure; CKP pattern learn procedure.
DTC CLEAR
1. Clear the DTC with the HDS while the engine is stopped.
2. Turn the ignition switch to LOCK (0).
3. Turn the ignition switch to ON (II), and wait 30 seconds.
4. Turn the ignition switch to LOCK (0), and disconnect the HDS from the DLC.
PCM RESET
1. Reset the PCM with the HDS while the engine is stopped.
2. Turn the ignition switch to LOCK (0).
3. Turn the ignition switch to ON (II), and wait 30 seconds.
4. Turn the ignition switch to LOCK (0), and disconnect the HDS from the DLC.
5. DO THE PCM IDLE LEARN PROCEDURE.
HOW TO END A TROUBLESHOOTING SESSION (REQUIRED AFTER ANY
TROUBLESHOOTING)
1. Reset the PCM with the HDS.
2. DO THE PCM IDLE LEARN PROCEDURE.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the HDS from the DLC.
NOTE: The PCM is part of the immobilizer system. If you replace the PCM, you must
use the HDS to instruct the new PCM and the immobilizer- keyless control unit
to recognize each other's unique serial code.
HOW TO TROUBLESHOOT CIRCUITS AT THE PCM CONNECTORS
NOTE:
The PCM stays on for about an hour after the ignition switch is turned to LOCK
(0). Jumping the SCS line after turning the ignition switch to LOCK (0) cancels
this function. Disconnecting the PCM during this function, without jumping the
SCS line first, can damage the PCM.
1. Jump the SCS line with the HDS.
2. Remove the cover (A).
Fig. 3: Identifying Cover
Courtesy of AMERICAN HONDA MOTOR CO., INC.
3. Disconnect PCM connectors A, B, and C.
NOTE:
PCM connectors A, B, and C have symbols (A=β’, B=delta, C=o) embossed
on them for identification.
Fig. 4: Disconnecting PCM Connectors
Courtesy of AMERICAN HONDA MOTOR CO., INC.
4. When diagnosis/troubleshooting is done at the PCM connectors, use the terminal test port (A) above the
terminal you need to check.
Fig. 5: Identifying Terminal Test Port
Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. Connect one side of the patch cord terminals (A) to a commercially available digital multimeter (B), and
connect the other side of the terminal (C) to a commercially available banana jack (Pomona Electronics
Tool No. 3563 or equivalent) (D).
Fig. 6: Identifying Connections Of Patch Cord Terminals With Digital Multimeter And Banana
Jack
Courtesy of AMERICAN HONDA MOTOR CO., INC.
6. Gently contact the pin probe (male) at the terminal test port from the terminal side. Do not force the tips
into the terminals.
NOTE:
ο¬
ο¬
For accurate results, always use the pin probe (male).
To prevent damage to the connector terminals, do not insert test
equipment probes, paper clips, or other substitutes as they can
damage the terminals. Damaged terminals cause a poor connection
and an incorrect measurement.
ο¬
Do not puncture the insulation on a wire. Punctures can cause or
eventually lead to poor or intermittent electrical connections.
OBD STATUS
The OBD status shows the current system status of each DTC and all of the parameters. This function is used to
see if the repair was successfully completed. The results of diagnostic tests for the DTC are displayed as:
ο¬
ο¬
ο¬
PASSED: The on board diagnosis is successfully finished.
FAILED: The on board diagnosis has finished but failed.
EXECUTING: The vehicle is in enable criteria conditions of the DTC, and the on board diagnosis is
running.
ο¬
ο¬
NOT COMPLETED: The on board diagnosis was running but is out of the enable conditions of the DTC.
OUT OF CONDITION: The vehicle has stayed out of the enable conditions of the DTC.
FUEL AND EMISSIONS SYSTEMS SYMPTOM TROUBLESHOOTING INDEX
SYMPTOM TROUBLESHOOTING INDEX
When the vehicle has one of these symptoms, check for a diagnostic trouble code (DTC) with the HDS. If there
is no DTC, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.
2024 Honda CR-V Owner's Manual
2023 Honda CR-V Owner's Manual
2021 Honda CR-V Owner's Manual
2018 Honda CR-V Owner's Manual
2015 Honda CR-V Owner's Manual
