DTC P0650 Malfunction Indicator Lamp
(MIL) Control Circuit
A voltage is supplied
directly to the malfunction indicator lamp (MIL). The powertrain
control module (PCM) controls the lamp by grounding the control circuit via an
internal switch called a driver. The primary function of the driver is to supply
the ground for the component being controlled. Each driver has a fault line
which is monitored by the PCM. When the PCM is commanding a component ON, the
voltage of the control circuit should be near 0 volts. When the PCM is
commanding the control circuit to a component OFF, the voltage potential of the
circuit should be near battery voltage. If the fault detection circuit senses a
voltage other than what is expected, the fault line status will change causing
the DTC to set.
Conditions
for Running the DTC
- Engine speed is greater than 600
RPM.
- The ignition voltage is between 6.0
volts and 16.0 volts.
Conditions
for Setting the DTC
- The PCM detects that the commanded
state of the driver and the actual state of the control circuit do not
match.
- The conditions are present for a
minimum of 10 seconds.
Action
Taken When the DTC Sets
- The PCM will not command the MIL ON.
The PCM stores DTC P0650 in memory when the diagnostic runs and fails.
- The PCM records the conditions
present at the time the diagnostic fails to the Freeze Frame.
Conditions
for Clearing the DTC
- A last test failed, or current DTC,
clears when the diagnostic runs and does not fail.
- A history DTC will clear after
40 consecutive warm-up cycles, if no failures are reported by this or
any other non-emission related diagnostic.
- Use a scan tool in order to clear
the DTC.
- If the ignition feed circuit is
suspected of being open, check if other bulbs on that circuit illuminate.
- Using Freeze Frame and/or Failure
Records data may aid in locating an intermittent condition. If the DTC
cannot be duplicated, the information included in the Freeze Frame and/or
Failure Records data can be useful in determining how many miles since the
DTC set. The Fail Counter and Pass Counter can also be used to determine
how many ignition cycles the diagnostic reported a pass and/or a fail.
Operate vehicle within the same Freeze Frame conditions (RPM, load,
vehicle speed, temperature etc.) that were noted. This will isolate when
the DTC failed.
The numbers below refer
to the step numbers on the diagnostic table.
|
Step |
Action |
Value(s) |
Yes |
No |
|
Did
you perform the Powertrain On-Board Diagnostic
(OBD) System Check? |
-- |
|||
|
Important If the I/P is completely
inoperative, refer to Instrument
Cluster System Check in Instrument Panel, Gauges and Console for further
diagnosis.
Does
the lamp turn ON and OFF with each command? |
-- |
Go to Diagnostic Aids |
||
Is
the lamp OFF? |
-- |
|||
|
Probe
the lamp control circuit in the PCM harness connector with a fused jumper
wire connected to ground. Refer to Using
Fused Jumper Wires in Wiring Systems. Is the lamp ON? |
-- |
|||
|
Repair
the short to ground in the lamp control circuit. Refer to Wiring
Repairs in Wiring Systems. Is the repair complete? |
-- |
-- |
||
Did
you find and correct the condition? |
-- |
|||
|
Inspect
for the following conditions:
Is
the repair complete? |
-- |
-- |
||
|
Important: Program the replacement
PCM. Refer to PCM
Replacement/Programming . Replace
the PCM. Is the action complete? |
-- |
-- |
||
Does
the scan tool indicate that this test passed? |
-- |
|||
|
Select
the Capture Info option and the Review Info option using the scan tool. Does
the scan tool display any DTCs that you have not diagnosed? |
-- |
Go to the applicable
DTC table |
System OK |