Content .. 71 72 73 74 ..

Acura RL. Manual - part 73

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The throttle valve opening angle is 17° or more, or 11° or less, for at least 2.5 seconds.

Driving Pattern

1. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the

radiator fan comes on, then let it idle.

2. Turn the ignition switch OFF.

3. Turn the ignition switch ON.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the
PCM memory.

Conditions for clearing the MIL

The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the
diagnostic runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by
disconnecting the battery.

DTC P16BB (116): ADVANCED DIAGNOSTICS

DTC P16BB: ALTERNATOR B TERMINAL CIRCUIT LOW VOLTAGE

Execution

Once per driving cycle

Sequence

None

Duration

2.5 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

Condition

Minimum

Maximum

Engine coolant temperature

158°F (69.5°C)

Battery voltage

6.0 V

Ignition switch

OFF

No active DTCs

P0117, P0118, P2101, P2108, P2118, P2135, P2176, U0107

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:06 PM

Fig. 240: Alternator B Terminal (Low Voltage) - Circuit Diagram

General Description

The alternator is driven by the engine and generates electricity to supply the necessary power to the
electrical system and to charge the battery. The alternator voltage target values of 14.5 V and 12.5 V are
achieved by switching the alternator control mode (controlled by the powertrain control module (PCM)).
The alternator output signal is sent to the PCM, and it varies according to the battery's state of charge, the
electrical load, and the engine rpm.

When the engine speed is a specified value and the IGP terminal voltage is below a set value when the
alternator is in the 14.5 V mode, and the alternator power generation amount is within the set range, and this
condition continues more than a set time, the PCM detects a malfunction and a DTC is stored.

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:06 PM

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The IGP terminal voltage is 12.0 V or less, and the alternator power generation amount is within 1.0% to
50.0% for at least 60 seconds.

Driving Pattern

1. Start the engine.

2. Maintain an engine speed of 500 rpm to 3,000 rpm.

3. Turn on the headlights (high beam) and rear window defogger.

Diagnosis Details

Conditions for illuminating the indicator

When a malfunction is detected, the DTC and the freeze frame data are stored in the PCM memory. The
MIL does not come on.

Conditions for clearing the DTC

The DTC and the freeze frame data can be cleared by using the scan tool Clear command or by
disconnecting the battery.

DTC P16BC (116): ADVANCED DIAGNOSTICS

DTC P16BC: ALTERNATOR FR TERMINAL CIRCUIT/IGP LOW VOLTAGE

Execution

Continuous

Sequence

None

Duration

60 seconds or more

DTC Type

One drive cycle, MIL OFF

OBD Status

N/A

Condition

Minimum

Maximum

Engine speed

500 rpm

3,000 rpm

Alternator control mode

14.5 V mode

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:06 PM

Fig. 241: Alternator FR Terminal Circuit Diagram

General Description

The alternator is driven by the engine and generates electricity to supply the necessary power to the
electrical load and to charge the battery. The alternator voltage target values of 14.5 V and 12.5 V are
achieved by switching the alternator control mode (controlled by the powertrain control module (PCM)).
The alternator output signal is sent to the PCM, and it varies according to the battery's state of charge, the
electrical load, and the engine rpm.

When the engine speed is a specified value and the IGP terminal voltage is below a set value when the
alternator is in the 14.5 V mode, and the alternator power generation amount is a set range or less, and this
condition continues more than a set time, the PCM detects a malfunction and a DTC is stored.

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:06 PM

Content .. 71 72 73 74 ..