Flashing d4 light

[Psychoward26]

I have a 93 accord with a 95 jdm h22a swap and when i turn the car on the d4 light flashes on the panel and the car accelerates extremely slow when in d4. but when i key the car off then back on again the problem stops. just looking for some input from somebody who has maybe had a similar problem?

[cb7_ex_coupe]

sounds like the tcu....

[ingold]

mine somewhat has this problem, not sure if it is the same but it might be.

my d4 light will come on, and when it does the only gears I have are first and third. if i leave my shifter in d4 it starts out in third gear and does not change. it seems to only happen when it rains though.

[cb7inct]

check the transmission seloniods (not sure if thats spelled right)

[deevergote]

The flashing D4 is like the "check engine light" for the transmission. It's the TCU (transmission computer) telling you that something is wrong with your transmission.


Read this:

Pulling CEL code....

http://www.cb7tuner.com/vbb/showthre...&threadid=7159

^^^^as a reference, visually


this is how to diagnose the CEL codes for the ecu. you find the blue jumper wire in the passenger kick pannel. and you run a line from one connector to another. if its a single digit code, it will flash quickly a bunch of times, just count them. if its double, like 21... it have two long flashes followed by one quick, then a pause and repeat.

heres what they all are:
00
ECU
Defective ECU

01
Primary O2 sensor
Open or short in O2 sensor circuit, defective Primary O2 sensor

02
Secondary O2 sensor
Open or short in O2 sensor circuit, defective Secondary O2 sensor

03
Manifold Absolute Pressure sensor
Open or short in MAP sensor circuit, defective MAP sesnor

04
Crankshaft Position sensor
Timing belt slipped, defective CP sensor

05
Manifold Absolute Pressure sensor
Reading too low or too high, defective MAP sensor

06
Engine Coolant Temp circuit
Reading too low or too high, open or short in circuit, defective ECT circuit

07
Throttle Position circuit
Reading too low or too high, open or short in circuit, defective TPS circuit

08
Top Dead Center sensor
Open or short in TDC sensor circuit, defective TDC sensor

09
Cylinder Position sensor
Open or short in CYP sensor circuit, defective CYP sensor

10
Intake Air Temperature sensor
Open or short in IAT sensor circuit, defective IAT sensor

12
Exhaust Gas Recirculation Valve
Open or short in EGR valve circuit, defective EGR valve

13
Barometric Pressure sensor circuit
Defective ECM (Barometric sensor)

14
Idle Control System Malfunction
Defective IAC valve, defective fast idle thermo valve, throttle body

15
Ignition Output Signal
Missing, defective or noisy Ignition Output Signal

16
Fuel Injector System
Defective or malfunctioning Fuel Injector System

17
Vehicle Speed sensor circuit
Open or short in VS sensor circuit, defective VS sensor

19
Lock-up Control Solenoid
Open or short in LCS circuit, defective LCS solenoid

20
Electrical Load Detector circuit
Open or short in ELD circuit, defective ELD circuit

21
VTEC Solenoid Valve
Open or short in VTEC solenoid valve circuit, defective VTEC solenoid valve

22
VTEC Oil Pressure Switch
Open or short in VTEC OPS circuit, defective VTEC pressure switch

23
Knock sensor circuit
Open or short in Knock sensor circuit, defective Knock sensor circuit

30
A/T FI Signal A high/low input
Defective AFSA line, TCM

31
A/T FI Signal B high/low input
Defective AFSB line, TCM

41
Primary Heated O2 sensor heater circuit
Open or short in Primary O2 sensor heater circuit, defective Primary O2 sensor heater circuit

43
Fuel Supply System
Defective or malfunctioning Fuel Supply System

45
System too lean/rich
Fuel supply system, Primary O2 sensor, MAP sensor, contaminated fuel, valve clearance, exhaust leakage

48
Lean Air Fuel sensor
Open or short in Lean Air Fuel sensor circuit, defective Lean Air Fuel sensor

54
Crankshaft Speed Fluctuation sensor
Open or short in CKF sensor circuit, defective CKF sensor circuit

58
Top Dead Center sensor #2
Open or short in TDC sensor circuit, defective TDC sensor

61
Primary Heated O2 sensor
Slow response, exhaust leak, defective Primary Heated O2 sensor

63
Secondary Heated O2 sensor
Slow response, exhaust leak, defective Secondary Heated O2 sensor

65
Secondary Heated O2 sensor circuit
Open or short in Secondary Heated O2 sensor circuit, defective Secondary Heated O2 sensor circuit


TCU Codes:

CODE LIST:

1-Lock-up solenoid 'A' circuit open or shorted.
2-Lock-up solenoid 'B' circuit open or shorted.
3-Throttle Position Sensor circuit open or shorted.
4-Vehicle Speed Sensor open or shorted - No signal from speedometer.
5-Shift Lever Position Switch circuit shorted.
6-Shift Lever Position Switch circuit open.
7-Shift Solenoid 'A' circuit open or shorted.
8-Shift Solenoid 'B' circuit open or shorted.
9-Counter shaft or transmission speed pulse generator open or shorted.
10-Coolant Temperature Sensor open or shorted.
11-Engine RPM (Ignition coil signal) open or shorted.
12-(No code 12 used)
13-Main shaft speed pulse generator open or shorted.
14-Linear (line pressure control) solenoid open or shorted.
15-Kick down switch circuit shorted.

[Psychoward26]

alright so i checked my tcu codes and it came back with code number 14. which is the FAS Wire , PGMFI. anyone got any ideas of what to do next? i honestly have no idea what to do here

[Teddy]

hi my cb did it once i thought it was a bad ground [the ground under the thermostat] i pull the ecu fuse it want away .. also the cable that goes to the trans[from the tb] controls how much presser the trans gets ..might be out of adjustment