[akuma06]

I'm trying to learn how to do tha ecu/ecm test but I have no idea how to do it...

[dustyboner]

[akuma06]

Hey thanks a lot

[drcao1]

When I was connecting the 2P Service Check Connector with a jumper and turning the Ignition on, the Check Engine Light was on but did not blink.
Do you think the ECU in my 1993 Hoda Civic DX is brocken?

[TxGreaseMonkey]

Drcao1, if the Check Engine Light stays on when the ignition switch is turned to ON (Position II), then the ECU has likely failed. This is common on older Hondas.

[drcao1]

TxGreaseMonkey:
I have disconnected old ECU from its harness and plan to connect a new ECU with the harness.
Before the connection, what should I check from the harness to provent the new ECU from darmage?

[TxGreaseMonkey]

Ensure that you are free of any static electricity, prior to touching the new ECM; therefore, properly ground yourself. Spray the old connectors with WD-40, which should help assembly.

[drcao1]

TxGreaseMonkey:

I followed your instruction and istalled a new remanufactured ECU(ECM). The engine starts working now. But shift stuck at park(automatic shift car). If insert a car key in unlock slot,the shift is able to moved to R, N and D4... easy and the car can be drived. If the shift moves back to Park, it could not be moved again.
What is wrong with my car? If the new ECU should be re-set? How to re-set it?

Thank you for your attetion and kind helps.

With Best Regards

[TxGreaseMonkey]

Automatic Transmission Interlock System

Honda automatic transmissions are equipped with the following devices to prevent inadvertent shifting:
. Automatic transmission selector with shift lock.
. Key cylinder with interlocked ignition key.

Shift Lock System:

The shift lock system prevents the shift lever from moving to Reverse or D4 from the Park position, unless the brake pedal is depressed and the accelerator is in its rest position.

Note:
. The shift lever cannot be shifted when the brake pedal and the accelerator are stepped on at the same time.
. In case of system malfunction, the shift lever can be released by pushing a key into the release slot near the shift lever.

Key Interlock System:

The ignition key cannot be removed from the ignition switch, unless the shift lever is in Park. When the shift lever is in any position other than Park, a solenoid is activated, making it impossible for the key to be removed, until the shift lever is moved to Park.

Troubleshooting:

If you are experiencing problems, particularly in cold weather, check for a faulty automatic transmission gear position switch (most likely). Next, check for a possible faulty steering lock assembly (key interlock solenoid and key interlock switch).

Automatic Transmission Gear Position Switch Replacement:

1. Remove console and disconnect 14-P connector from switch.
2. Remove both console switch mounting nuts.
3. Position switch slider to "Neutral."
4. Move shift lever to "Neutral," then slip switch into position.
5. Attach switch with both nuts.
6. Test switch in Park and Neutral positions of shift lever. Engine should start, when shift lever is in Neutral (anywhere in the range of free play).
7. Connect 14-P connector, clamp harness, and install console.

Also, take a test light or multi-meter and check all under hood and under dash fuses. These fuses can affect power going to the 8-P connector and the interlock control unit. Check for good contact between the connector and socket terminals. If the problem remains, you may want to replace the interlock control unit, which is located near the left kick panel (close to the main relay). These are sophisticated systems that can sometimes challenge the best technicians.

[TxGreaseMonkey]

After you get everything working properly, be sure to change the transmission fluid--3 quarts of Honda Z-1 ATF.

[drcao1]

After you get everything working properly, be sure to change the transmission fluid--3 quarts of Honda Z-1 ATF.

TxGreaseMonkey:

Is 'automatic transmission gear switch' 'ignition switch'? Where it is in car?

[TxGreaseMonkey]

Remove the center console. You may need to buy a Haynes Manual.

[drcao1]

Automatic Transmission Interlock System

Honda automatic transmissions are equipped with the following devices to prevent inadvertent shifting:
. Automatic transmission selector with shift lock.
. Key cylinder with interlocked ignition key.

Shift Lock System:

The shift lock system prevents the shift lever from moving to Reverse or D4 from the Park position, unless the brake pedal is depressed and the accelerator is in its rest position.

Note:
. The shift lever cannot be shifted when the brake pedal and the accelerator are stepped on at the same time.
. In case of system malfunction, the shift lever can be released by pushing a key into the release slot near the shift lever.

Key Interlock System:

The ignition key cannot be removed from the ignition switch, unless the shift lever is in Park. When the shift lever is in any position other than Park, a solenoid is activated, making it impossible for the key to be removed, until the shift lever is moved to Park.

Troubleshooting:

If you are experiencing problems, particularly in cold weather, check for a faulty automatic transmission gear position switch (most likely). Next, check for a possible faulty steering lock assembly (key interlock solenoid and key interlock switch).

Automatic Transmission Gear Position Switch Replacement:

1. Remove console and disconnect 14-P connector from switch.
2. Remove both console switch mounting nuts.
3. Position switch slider to "Neutral."
4. Move shift lever to "Neutral," then slip switch into position.
5. Attach switch with both nuts.
6. Test switch in Park and Neutral positions of shift lever. Engine should start, when shift lever is in Neutral (anywhere in the range of free play).
7. Connect 14-P connector, clamp harness, and install console.

Also, take a test light or multi-meter and check all under hood and under dash fuses. These fuses can affect power going to the 8-P connector and the interlock control unit. Check for good contact between the connector and socket terminals. If the problem remains, you may want to replace the interlock control unit, which is located near the left kick panel (close to the main relay). These are sophisticated systems that can sometimes challenge the best technicians.

TxGreaseMonky:

Is the " Autometic Transmission Gear Switch" " Neutral Safty Switch" ?
If the two names are for the same parts?

Thank you for your help.

With Best Regards

[TxGreaseMonkey]

A/T Gear Position Switch or Neutral Position Switch.

[drcao1]

A/T Gear Position Switch or Neutral Position Switch.

How to check an old Neutral safety switch is faulty?

[TxGreaseMonkey]

Check continuity and check adjustment.

[drcao1]

Check continuity and check adjustment.

TxGreaseMonkey;

I disconncted the old neutral savety switch from 14P connector and measured OM between two bigest pins of the switch. The OM was 0 at Park and Neutrol positions and infinity at R and D4 positions. Do you think the switch is bad?
By the way, I could not find 'Key interlock solenoid" and "Key interlock switch" in both Autozon and Advace Aotoparts. If the two parts have other names?

Thank you for your kind helps

With Best Regards

[TxGreaseMonkey]

From afar, I hesitate to say yes--I defer to your judgment.

[drcao1]

From afar, I hesitate to say yes--I defer to your judgment.

I will order a new neutral safety switch for the replacement.
Thank you for your immediate response and kind help.

With Best Regards

[TxGreaseMonkey]

It certainly won't hurt.