DTC Troubleshooting: P16BC (116)

DTC P16BC: Alternator FR Terminal Circuit/IGP Circuit Low Voltage Check for poor connections at the alternator 4P connector. Are the connectors OK?
YES | - | Go to Step 2 .
NO | - | Reconnect the connector, then go to Step 18 .
Turn the ignition switch ON (II). Clear the DTC with the HDS. Start the engine. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam Hold the engine speed at 2,000 rpm (min −1 ) (in Park or neutral) for 1 minute. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BC indicated?
YES | - | Go to Step 8 .
NO | - | Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the alternator.■
Turn the ignition switch OFF. Disconnect the alternator 4P connector. Turn the ignition switch ON (II). Measure voltage between alternator 4P connector terminal No. 1 and body ground. Is there battery voltage?
YES | - | Go to Step 12 .
NO | - | Repair open in the wire between the alternator (IG1 line) and the No. 18 ACG (15 A) fuse in the under-dash fuse/relay box, then go to Step 18 .

Measure voltage between alternator 4P connector terminal No. 4 and body ground. Is there about 5 V?
YES | - | Replace the alternator, then go to Step 18 .
NO | - | Go to Step 13 .
Turn the ignition switch OFF. Jump the SCS line with the HDS. Disconnect ECM/PCM connector B (24P). |

Connect alternator 4P connector terminal No. 4 to body ground with a jumper wire. |

Check for coutinuity between ECM/PCM connector terminal B13 and body ground. Is there continuity?
YES | - | Go to Step 26 .
NO | - | Repair open in the wire between the ECM/PCM (B13) and the alternator, then go to Step 18 .
Reconnect all connectors. Turn the ignition switch ON (II). Reset the ECM/PCM with the HDS. Do the ECM/PCM idle learn procedure. Start the engine. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam Hold the engine speed at 2,000 rpm (min −1 ) (in Park or neutral) for 1 minute. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated?
YES | - | If DTC P16BC is indicated, check for poor connections or loose terminals at the alternator and the ECM/PCM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | Troubleshooting is complete.■
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. Start the engine. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam Hold the engine speed at 2,000 rpm (min −1 ) (in Park or neutral) for 1 minute. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated?
YES | - | If DTC P16BC is indicated, check for poor connections or loose terminals at the alternator and the ECM/PCM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. ■